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SELECTING THE CORRECT FILTERS FOR THE JOB

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AHU FILTER SELECTION GUIDE

Filter selection in Air Handling Units (AHUs) plays a critical role in meeting indoor air quality (IAQ) standards, maintaining occupant health, and ensuring energy-efficient operation. This section serves as your essential AHU filters selection guide, explaining how to choose single-stage or multi-stage filters based on real-world air pollution data from DEFRA, ODA/SUP classification under the EN ISO 16890 standard, and expected cumulative filtration efficiency (ePM1, ePM2.5, and ePM10 ratings).

Understanding the Outdoor Air Quality (ODA Category) is the first step. You can find DEFRA air data, including annual mean PM2.5 air quality levels for the UK, from the following official and reliable sources: (As shown in figure 1) 

https://uk-air.defra.gov.uk/

Selecting the correct filters for the job
Figure 1: DEFRA Air Data for London location

Step 1: Determine outdoor air quality (ODA Category)

Begin by identifying the full site address, including the postcode where the air handling unit (AHU) is to be installed.

Refer to DEFRA’s latest annual mean PM2.5 data to determine the correct Outdoor Air (ODA) classification for the location:

  • ≤10 µg/m³ → ODA 1 (Clean Air, Urban)
  • 10–15 µg/m³ → ODA 2 (Moderate Pollution, Town or City)
  • >15 µg/m³ → ODA 3 (Heavy Pollution, Industrial)

Assigning the correct ODA category ensures that the selected filtration system aligns with local air quality levels and complies with EN ISO 16890 standards.

Step 2: Define indoor air quality needs (SUP Category)

Based on the application type, assign the appropriate Supply Air (SUP) category, along with its corresponding target filtration efficiency. (As shown in Figure 2) 

Selecting the correct filters for the job
Figure 2: Table demonstrating the SUP category and corresponding target filtration

Step 3: Identify minimum filtration efficiency using the ODA/SUP matrix

Consult the ODA/SUP matrix (see below) to determine the minimum required cumulative filtration efficiency for your application based on the assigned Outdoor Air (ODA) and Supply Air (SUP) categories. (As shown in Figure 3) 

For example: A healthcare project located in a high-pollution zone (ODA 3) with a SUP 2 requirement would typically demand a higher filtration class to remain compliant.

  • ODA 3 + SUP 2 → ePM1 ≥ 80%
  • ODA 2 + SUP 3 → ePM2.5 ≥ 70% 
Selecting the correct filters for the job
Figure 3: Air quality categorisation

The matrix is aligned with EN ISO 16890 and helps ensure compliance by defining the minimum cumulative ePM1 or ePM2.5 efficiency levels for your specific AHU configuration.

Step 4: Select single or multi-stage filters based on cumulative ePM1 efficiency

Refer to the cumulative ePM1 efficiency chart below (As shown in Figure 4). It compares the performance of:

  • Single-stage filters (F7 or F9)
  • Two-stage filters (e.g., G4 + F7, G4 + F9)
  • 3-stage configurations (e.g., G4 + F7 + F9)

Use this to validate that your selected combination meets or exceeds the required filtration efficiency for the assigned ODA/SUP classification.

Selecting the correct filters for the job
Figure 4: Comparison table for using Single, Two and Three Stage Filtration
Selecting the correct filters for the job
Figure 5: Cumulative ePM1 efficiency

Note: Cumulative ePM1 efficiency refers to the total filtration impact of all stages combined. For instance, a G4 + F9 setup may outperform an F9 alone due to better particulate loading and reduced leakage across stages. (As shown in Figure 5) 

To select single-stage or multi-stage filters using cumulative efficiency, the key is to match the final required EN ISO 16890 efficiency (ePMx) with your ODA/SUP combination.
To further simplify the procedure, use our tool to select the correct filters and confirm compliance with ISO EN 16890:

ECE UK Filter Configuration Tool

Step 5: Check Flowchart for Correct Procedure Guidance

To ensure the correct procedures have been followed, use this quick visual guide to verify that you have the appropriate filter configuration for your AHU. (As shown in Figure 6)

Selecting the correct filters for the job
Figure 6: Filter selection flowchart

Final filter selection checklist

By the time you complete all the steps, a correctly selected filter should meet all the required parameters, as shown in Figure 7. 

Selecting the correct filters for the job
Figure 7: Final filter selection checklist

Selecting the correct filters for the job

Conclusion: Achieving compliance with confidence

Selecting the right filters for your air handling unit (AHU) is not just a matter of operational performance—it directly impacts indoor air quality (IAQ), energy efficiency, and compliance with EN ISO 16890 and Part F of UK Building Regulations. By aligning ODA/SUP classifications with cumulative ePM1 filtration efficiency and referring to real-world pollution data from DEFRA, you ensure that your HVAC specification supports both regulatory requirements and long-term ventilation strategy goals. For sourcing high-quality replacement filters that meet these standards, visit AAH UK.

ECE UK supports building services professionals, consultants, and facilities managers with expert advice, practical tools, and robust technical documentation. From filter selection to full air handling unit maintenance, our services are designed to support best practices and lifecycle performance. If you’re unsure whether your installation meets current standards, request an air handling unit condition report or contact us to learn more about our management systems.

Explore our complete range of air handling units, filtration components, and support tools to ensure your building is operating at peak performance—with health, efficiency, and compliance built in.

Frequently asked questions

Cumulative ePM1 efficiency refers to the total filtration performance across all stages of your filter configuration. This metric is essential under EN ISO 16890 to ensure that fine dust particles and PM2.5 are effectively removed.

Not necessarily. Your choice between single-stage and multi-stage filters depends on your ODA/SUP combination, application type, and target IAQ levels. A healthcare or education setting, for example, may require enhanced configurations.

Regular air handling unit maintenance ensures filters are functioning correctly, reducing pressure drops and maintaining airflow efficiency—key factors in optimising HVAC system performance and reducing energy costs.

ECE UK provides expert air handling unit condition reports to assess current performance, identify risks, and recommend improvements based on EN ISO 16890 and BS EN 16798-3.

Our management systems support proactive maintenance scheduling, lifecycle tracking, and compliance documentation—ensuring every system meets regulatory and operational standards.

Contact our team today

Get straight through to one of our engineers and start discussing the needs of your new air handling unit. Our team are on hand to work out a custom solution for you and your project. Just call 01634 729 690 or send us an email at sales@eceuk.com to get started.

our enquiry form

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]]> Wet Efficiency In RXA Thermal Wheels https://www.eceuk.com/knowledge-hub/technical-guides/wet-efficiency-thermal-wheels/ Mon, 11 Aug 2025 16:15:30 +0000 https://www.eceuk.com/?p=3548 The post Wet Efficiency In RXA Thermal Wheels appeared first on ECE UK.

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Wet Efficiency In RXA Thermal Wheels

For expertly carried out FATs, call 01634 729 690.

Wet Efficiency In RXA Thermal Wheels

In HVAC systems designed for environments requiring precise humidity control, various types of thermal wheels play a vital role, particularly the condensation, enthalpy, and sorption wheels featured in ECE UK Ltd’s RXA thermal wheel range. These advanced rotary heat exchangers not only enable efficient heat recovery but also support effective moisture transfer, significantly enhancing heat recovery ventilation and overall system performance.

Understanding the core principles behind these systems and how wet efficiency applies can help optimise functionality, support better indoor climate control, and improve air handling unit performance across commercial and industrial applications.

Below is a practical illustration of the Structure of Rotary Exchanger Aluminium (RXA), as shown in Figure 1. This detailed diagram of a rotary heat exchanger highlights its key components and features. It provides a clear, labelled view of how the unit functions as an energy recovery device, showcasing the design elements, such as the rotating storage mass, precision stepper motor, and high-tightness brush seal that contribute to its efficiency, flexibility and long-term performance.

Wet Efficiency In RXA Thermal Wheels

Wet Efficiency In RXA Thermal Wheels
Figure 2: General Principle Of Operation In RXA Thermal Wheels

Principle Of Operation: How The RXA Rotary Thermal Wheels Work

Rotary heat exchangers, also known as regenerative heat exchangers, play a central role in air handling unit (AHU) systems, particularly where heat recovery ventilation is essential. These systems operate through the continuous rotation of a rotor, allowing supply and exhaust air streams to pass alternately through the same medium.

As the rotor spins, it absorbs heat and moisture from the exhaust air and transfers this energy to the incoming fresh air, significantly enhancing overall system efficiency. This process is illustrated in Figure 2, which shows the alternating airflow paths within the exchanger and how energy is effectively transferred between the two airstreams. This alternating airflow pattern also makes the system largely self-cleaning and frost-resistant.

Thanks to their ability to recover both sensible heat (temperature) and latent heat (moisture), rotary exchangers are known for their high performance. Typical thermal efficiencies range from 73% to 90%, with pressure drops maintained below 200 Pa, depending on the configuration. The heat recovery rate can also be adjusted by controlling the rotor’s motor speed (rpm), providing greater flexibility and energy optimisation across seasonal demands.

What Is Wet Efficiency In HVAC Systems?

In high-performance HVAC systems, particularly those using rotary heat exchangers, wet efficiency serves as a critical performance indicator. It evaluates how effectively a system can recover both sensible heat (temperature changes) and latent heat (changes in moisture content).

This dual focus is especially vital in applications with variable humidity loads, such as hotels, offices, and other commercial spaces. In such environments, maintaining indoor comfort goes beyond temperature control; humidity regulation plays a major role in occupant well-being, energy efficiency, and indoor air quality (IAQ).

Wet efficiency directly reflects a system’s ability to transfer moisture from exhaust to supply air, thereby reducing the need for additional dehumidification or humidification. Optimising this efficiency can lead to lower energy consumption and more stable internal climate control throughout the year.

Rotor Type And Their Role In Wet Efficiency

The performance of a rotary heat exchanger in managing moisture and heat transfer is strongly influenced by the type of rotor used. Each rotor variant has distinct construction characteristics and humidity transfer mechanisms suited to specific operational contexts.

As shown in Table 1, there are three primary rotor types used in RXA thermal wheels:

Type of Rotor Rotor Matrix Humidity Transfer Principle
Condensation  Polished or epoxy-coated aluminium Humidity transfer when condensation is present
Enthalpy  Surface with partially sorption coating (3Å molecular sieve) Medium humidity transfer via adsorption and additional condensation if present
Sorption  Surface with sorption coating (3Å molecular sieve) Large humidity transfer via adsorption

Table 1: Construction and Humidity Overview of Rotor Types

Each of these rotor types offers a distinct balance of heat and moisture recovery, allowing for the tailoring of the system’s wet efficiency to meet seasonal demands, local humidity levels, and ventilation design objectives.

How Wet Efficiency Applies To
Thermal Wheel Technologies

In rotary heat exchangers, wet efficiency refers to the system’s ability to transfer both moisture (latent heat) and temperature (sensible heat) between airflows. This becomes particularly crucial in ventilation systems, where humidity control, energy savings, and thermal comfort are top priorities.

Rotary wheels (also known as thermal wheels) come in various configurations, depending on the application, each offering distinct levels of wet efficiency. Below, we explore three key types: sorption wheels, enthalpy wheels, and condensation wheels and how their material structure and design influence their performance.

Wet Efficiency In RXA Thermal Wheels
Figure 3: Structure of Storage Mass or Rotor Matrix

  1. Sorption Wheels

    RXA sorption wheels are equipped with advanced materials that effectively adsorb moisture from the incoming airstream and release it into the outgoing airstream. Wet efficiency for these units evaluates how well they manage moisture transfer while recovering heat, maximising performance in environments where humidity control is critical.

    The high-performance desiccant coatings of the sorption rotor (3å molecular sieve) provide maximum humidity transfer capacity with minimal carryover.

    Sorption rotors offer an effective method of cooling and dehumidifying outside air before it reaches the air handling unit’s cooling coil. This leads to:

    • Lower investment cost in cooling capacity (20–50% savings), allowing for smaller chillers and condensing units
    • Lower energy consumption during cooling periods
    • Better indoor air quality
    • Increased humidity in winter
    • Lower investment and operating costs for humidification

    The RXA sorption wheels’ effectiveness in varying humidity conditions is highlighted through their moisture transfer capability, which directly impacts indoor humidity levels. They are ideally suited for ventilation systems with mechanical cooling.

    As shown in Figure 3, a close-up of the rotor matrix (storage mass), the heart of the rotary heat exchanger. The image reveals a highly textured, corrugated surface made up of narrow passageways that maximise surface area for efficient heat and moisture exchange.

  1. Enthalpy Wheels

    RXA enthalpy wheels are partially coated with a sorption agent, enabling them to transfer moisture even during transitional periods when humidity levels fluctuate. This feature enhances wet efficiency by allowing the unit to manage both sensible and latent heat, making it highly effective during spring and autumn.

    The hygroscopic surface of this rotor class supports humidity transfer and is typically used for standard applications in comfort ventilation systems to recover moisture during winter.

    By optimising moisture transfer throughout the year, RXA enthalpy wheels contribute significantly to overall energy efficiency and indoor comfort.
    They are ideally suited for commercial buildings, offices, hotels, and high-end residential spaces. The improved room climate is a result of the higher indoor air humidity maintained in colder periods.

Condensation Wheels

RXA condensation thermal wheels are designed to operate effectively during winter when moisture in the extract air condenses within the wheel’s storage mass. In this case, wet efficiency evaluates how well the wheel recovers latent heat from the moisture that condenses and then transfers it to the incoming fresh air.

These wheels act as a cost-efficient solution for recovering heat and are suitable for standard comfort ventilation applications. Humidity is only transferred when the dew point of one of the air streams is reached during winter.

This unique capability allows condensation wheels to enhance indoor humidity management in colder months, ensuring consistent comfort and well-regulated air conditions. They are ideally suited for commercial and office buildings, hotels, and high-end housing.

Below is an image (Figure 4) of a condensation-type thermal wheel installed inside a ventilation unit. The image highlights the semi-transparent rotor disc mounted within a metallic housing. The grooved surface and slow rotation help retain and transfer heat from condensation, enabling efficient moisture and temperature exchange.

Wet Efficiency In RXA Thermal Wheels
Figure 4: Photo of Condensation Wheel

System-Wide View: Evaluating Combined Sensible And Latent Heat Recovery

Now that we’ve explored how each RXA wheel type, sorption, enthalpy, and condensation contribute to heat and moisture transfer, it’s essential to step back and consider the overall efficiency of the system.

Wet efficiency provides a comprehensive performance indicator, enabling engineers to assess how effectively both sensible heat (temperature) and latent heat (moisture) are recovered across all rotor types. This combined view is crucial in real-world HVAC environments, where thermal loads fluctuate with changing seasons and occupancy levels.

By assessing both temperature and humidity recovery simultaneously, wet efficiency provides a more accurate reflection of system performance and potential energy savings across a wide range of applications, from commercial buildings to climate-sensitive facilities. It also ensures better alignment with indoor air quality standards and ventilation design goals, helping reduce overall energy consumption while maintaining consistent comfort.

Wet Efficiency In RXA Thermal Wheels

Conclusion

When designing HVAC systems that incorporate RXA Sorption, Condensation, or Enthalpy wheels, wet efficiency should serve as a guiding factor for engineers looking to optimise moisture management without sacrificing heat recovery performance.

By prioritising wet efficiency during the specification and selection process, ECE UK Ltd ensures each thermal wheel delivers the right balance of sensible and latent heat recovery tailored to the system’s operational demands.

This dual-focus approach not only enhances energy savings and system efficiency but also contributes to improved indoor climate control, air quality, and overall occupant comfort throughout the year.

At ECE UK Ltd, our in-depth understanding of energy efficiency enables us to develop and implement HVAC solutions that excel in both temperature and humidity regulation, particularly in commercial environments where optimal cooling performance and precise humidity control are crucial to long-term success.

Contact our team today

Get straight through to one of our engineers and start discussing the needs of your new air handling unit. Our team are on hand to work out a custom solution for you and your project. Just call 01634 729 690 or send us an email at sales@eceuk.com to get started.

our enquiry form

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]]> Optimise Specific Fan Power in AHUs – Complete Guide https://www.eceuk.com/knowledge-hub/blog/optimising-specific-fan-power-air-handling-units/ Wed, 30 Jul 2025 14:23:05 +0000 https://www.eceuk.com/?p=3206 The post Optimise Specific Fan Power in AHUs – Complete Guide appeared first on ECE UK.

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Optimising Specific Fan Power in AHUs: A Collaborative Approach by ECE UK Ltd with Design Engineers and HVAC Professionals

At ECE UK Ltd, we are dedicated to advancing energy efficiency and sustainability in building design, particularly in the realm of commercial HVAC systems in UK. As a leading air handling units manufacturer, we understand that a critical factor influencing HVAC energy efficiency is Specific Fan Power calculation and optimisation. Defined as the energy consumption of fans in relation to the airflow they produce, SFP is an essential metric for assessing the performance of ventilation systems. Through collaborative partnerships with design engineers and HVAC professionals, we can significantly reduce HVAC fan energy consumption through strategic ventilation system design, efficient air handling units (AHUs), and advanced motor technologies.

Optimise Specific Fan Power in AHUs - Complete Guide

What Is Specific Fan Power (SFP) in HVAC Systems?

Specific Fan Power is a crucial metric that measures the energy consumption of fans in relation to the airflow they produce, making it an essential indicator for assessing the performance of energy-efficient ventilation systems. This critical measurement is determined by two main components:

  • Internal resistance of the air handling unit
  • External resistance caused by the ductwork and air flow resistance

The final SFP figure directly impacts the overall HVAC energy efficiency of the fan system. Unfortunately, many design approaches overlook the comprehensive relationships between ventilation system design, AHU performance, and fan operations, potentially leading to inflated SFP values that compromise sustainable HVAC design.

Why SFP Matters in Energy-Efficient Building Design

Understanding and optimising SFP is fundamental to creating sustainable ventilation solutions that contribute to both environmental goals and operational cost savings. When SFP values are elevated, it indicates that the HVAC commissioning process may need refinement, and the system requires more energy to move the same volume of air.

Key benefits of optimised SFP include:

  • Reduced energy consumption and operational costs
  • Enhanced indoor air quality improvement
  • Better system reliability and longevity
  • Compliance with sustainable HVAC design standards
  • Improved overall commercial HVAC systems UK performance

How Duct Length and Air
Velocity Affect SFP

Reducing Duct Length for Optimal Performance

One of the most effective strategies for minimising SFP is to reduce the length of the ductwork. Longer ducts with more bends generate greater friction (Figure 1), resulting in increased resistance that the fan must overcome. By shortening the duct length (Figure 2), we can significantly lower the external pressure losses, making it easier for the fan to operate. This not only reduces energy consumption but also enhances system performance and reliability.

Figure 1: Long Duct Increased Bends
Figure 1: Long Duct Increased Bends

Figure 2: Straight Short Duct Run
Figure 2: Straight Short Duct Run

This approach not only reduces HVAC fan energy consumption but also enhances system performance and reliability, contributing to better HVAC commissioning outcomes.

Figure 3: Air moving through gradually expanding duct
Figure 3: Air moving through gradually expanding duct

Maintaining Low Air Velocity

In conjunction with reducing duct length, maintaining lower air velocities within the ductwork is crucial for minimising SFP and improving ventilation system design (Figure 3). Elevated air velocities lead to increased turbulence and friction losses, which elevate the energy requirements for air movement.

Benefits of Using IE6 Permanent Magnet Motors

The selection of high-performance Air Handling Units (AHUs) is vital in achieving low SFP values and optimal sustainable HVAC design. As an experienced air handling units manufacturer, ECE UK Ltd promotes the use of IE6 permanent magnet motors in modern AHUs, which provide superior efficiency compared to traditional motors.

Enhanced Efficiency Performance

IE6 permanent magnet motors (Figure 4) are engineered for high efficiency across various operational conditions, translating into reduced HVAC fan energy consumption and lower SFP values. These advanced motors represent the pinnacle of energy-efficient ventilation systems technology.

Figure 4: IE6 High Efficiency Fan with Permanent Magnet Motors
Figure 4: IE6 High Efficiency Fan with Permanent Magnet Motors
Figure 5: £ Savings Per Year for different motor operating schedules
Figure 5: £ Savings Per Year for different motor operating schedules

Adaptive Control Features:

These motors integrate seamlessly with sophisticated control systems that monitor and adjust fan speeds in real-time to align with demand. This capability significantly reduces excess energy use during periods when full capacity is unnecessary, optimising Specific Fan Power calculation results.

Lower Internal Resistance:

By choosing AHUs with optimised internal components—including advanced heat exchangers and filters with enhanced nano technology (Figure 6)—internal resistance can be decreased further. This enhancement improves airflow efficiency and reduces SFP while contributing to better indoor air quality improvement.

Regular air handling unit maintenance ensures these advanced components continue operating at peak efficiency throughout their lifecycle.

Figure 6: Filter with Enhanced Nanoclass Technology
Figure 6: Filter with Enhanced Nanoclass Technology

Role of Heat Recovery Units in
Reducing SFP

Increased thermal efficiency in heat recovery ventilation units positively influences Specific Fan Power calculation in accordance with the Ecodesign Directive 1253/2014 by reducing the energy consumption associated with the fan system.

Figure 7: Transfer of heat and coolth between the exhaust and supply air
Figure 7: Transfer of heat and coolth between the exhaust and supply air

Thermal Energy Transfer Optimisation

Heat recovery components in Air Handling Units (AHUs) facilitate thermal energy transfer between the exhaust and supply air streams (Figure 7), reducing the amount of additional heating or cooling required. This process decreases the heating and cooling coil size, which in turn reduces the resistance across each coil.

Enhanced System Performance

Higher thermal efficiency means more effective heat transfer, leading to:

  • Reduced thermal loads on downstream heating or cooling systems
  • Lower auxiliary energy requirements for temperature conditioning
  • Decreased pressure drop across the heat recovery unit
  • Improved HVAC energy efficiency overall

When thermal efficiency increases, the temperature difference that the fan needs to overcome diminishes, allowing the fan to operate at lower power for the same airflow rate, directly improving sustainable HVAC design performance.

Ecodesign Directive Benefits

The Ecodesign Directive 1253/2014 incorporates a performance-based approach that allows for adjustments or “bonuses” in compliance criteria based on enhanced heat recovery ventilation efficiency. For units with higher thermal efficiency (exceeding certain thresholds), the regulation provides bonus points or relaxations in SFP limits, recognising superior energy-efficient ventilation systems performance.

Sustainable Ventilation Solutions

At ECE UK Ltd, we believe that achieving optimal SFP values requires a collaborative effort involving engineers and HVAC professionals specialising in commercial HVAC systems UK. By engaging in joint discussions during the early design phase, we ensure that all aspects of the ventilation system design are integrated effectively.

This collaborative approach allows us to:

  • Analyse both internal AHU resistance and external duct resistance comprehensively
  • Develop innovative designs that enhance overall system performance
  • Optimise Specific Fan Power calculation from the outset
  • Ensure proper HVAC commissioning procedures
  • Deliver sustainable ventilation solutions that meet environmental goals

Learn more through our
comprehensive case study

Hinckley CDC

LEARN MORE

Optimise Specific Fan Power in AHUs - Complete Guide

Conclusion

In our commitment to providing sustainable ventilation solutions, ECE UK Ltd recognises the critical importance of lowering Specific Fan Power in Air Handling Units. Through the strategic implementation of shorter, low-velocity duct designs, coupled with high-efficiency Air Handling Units (AHUs) and IE6 permanent magnet motors, we achieve remarkable reductions in HVAC fan energy consumption.

By fostering collaboration among HVAC professionals and engineers, we pave the way for more efficient commercial HVAC systems UK that contribute to our collective environmental goals. Our comprehensive approach to sustainable HVAC design, combined with expert HVAC commissioning and ongoing air handling unit maintenance, ensures optimal indoor air quality improvement and long-term system performance.

Together, we can address the challenges of HVAC energy efficiency and work toward a greener future through innovative energy-efficient ventilation systems that prioritise both performance and sustainability. Contact ECE UK Ltd today to discover how our expertise in thermal energy transfer and advanced ventilation system design can optimise your next project.

Contact our team today

Get straight through to one of our engineers and start discussing the needs of your new air handling unit. Our team are on hand to work out a custom solution for you and your project. Just call 01634 729 690 or send us an email at sales@eceuk.com to get started.

our enquiry form

The post Optimise Specific Fan Power in AHUs – Complete Guide appeared first on ECE UK.

]]> T2/TB2 vs T4/TB4: Navigating thermal classifications between healthcare and commercial projects https://www.eceuk.com/knowledge-hub/blog/t2-tb2-vs-t4-tb4-ahu-thermal-classifications-explained/ Wed, 30 Jul 2025 10:16:34 +0000 https://www.eceuk.com/?p=3185 The post T2/TB2 vs T4/TB4: Navigating thermal classifications between healthcare and commercial projects appeared first on ECE UK.

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In an HVAC industry where performance expectations and cost pressures often clash, getting AHU thermal classifications right can be the difference between a well-optimised system and an unnecessarily expensive one.

At ECE UK, we understand that in an increasingly competitive landscape, the importance of precise thermal classifications cannot be overstated.

As a leading manufacturer of air handling units, we face a pivotal question: how essential are classifications such as T2/TB2 thermal classification (as shown in Figure 1) for healthcare HVAC design, compared to T4/TB4 AHU specification (as shown in Figure 2) for commercial and retail environments?

Understanding the framework of BS EN 1886:2007 for thermal performance ratings provides valuable insight into how the difference between T2/TB2 and T4/TB4 AHUs impacts system performance, compliance, and cost-efficiency.

To ensure continued performance, don’t forget to explore our services for air handling unit maintenance and air handling unit condition reports, which support optimal operation throughout the lifecycle.

Our commitment to engineering precision is backed by our management systems, designed to uphold the highest standards across all sectors.

Figure 1: T2/TB2 Framework
Figure 1: T2/TB2 Framework

Figure 2: T4/TB4 Framework
Figure 2: T4/TB4 Framework

Are we over specifying AHUs

In healthcare projects, such as those adhering to HTM 03-01 guidelines, the pressure to specify T2/TB2 thermal classification is justified by the need for stringent air quality and environmental control.

These standards serve as safeguards, ensuring that air handling units meet the rigorous demands for indoor air quality and temperature regulation crucial for patient care. However, over-specifying T2/TB2 can inflate costs and create unnecessarily complex systems that may exceed actual performance needs.

In contrast, when it comes to commercial and retail environments, the use of T4/TB4 AHU specifications can yield cost-effective solutions without compromising system performance. These specifications allow for flexibility, reducing unnecessary expenditure while maintaining acceptable air quality standards — particularly in settings that may not require the same level of scrutiny as healthcare HVAC design.

To ensure ongoing efficiency, consider scheduling an air handling unit condition report to assess whether current classifications are aligned with your operational requirements.

Figure 3: T - class ratings

Figure 3: T – class ratings

What do T-class ratings really mean

Thermal transmittance in HVAC, rated from T1 to T5 under the framework of BS EN 1886:2007, quantifies heat transfer through the AHU casing. A T1 rating signifies exceptional efficiency in minimising heat transfer, while a T5 represents the highest level of thermal loss (as shown in Figure 3).

By delineating these classifications, BS EN 1886:2007 offers a structured way to assess the suitability of air handling units across different environments.

In healthcare HVAC design, choosing T2 often seems prudent, aligning with the stringent demands for temperature maintenance and air-quality control.

However, in commercial HVAC applications, T4/TB4 AHU specification can be effectively deployed to optimise performance while remaining budget conscious.

Our commitment at ECE UK is to provide AHU thermal classifications and engineering solutions tailored to fit the operational realities and environmental conditions specific to each project.

Why TB-class ratings matter?

A TB1 rating indicates minimal risk of condensation, while TB2 acknowledges only a very small increase. Given the intense focus on sterilisation and air quality in healthcare HVAC design, TB2 ratings are not just common but essential for compliance with air handling unit requirements for hospitals.

In contrast, a T4/TB4 classification may suffice in commercial and retail environments, where the operational conditions allow for more leniency. Misapplying T2/TB2 thermal classification in these cases can complicate specifications unnecessarily and inflate project costs without enhancing performance.

Figure 4: Diabetes Centre AHU

Figure 4: Diabetes Centre AHU

Where high specs hurt more than help

The prevailing trend toward specifying T2 and TB2 across various projects raises concerns akin to the ubiquitous approach of selecting neutral wall colours in design. Though these classifications may indicate a desire for high air handling unit efficiency, they often lack the contextual justification required for optimal application.

Such practices not only limit competition among suppliers but also risk inflating project budgets, particularly in commercial and retail HVAC cost optimisation scenarios.

To avoid misapplication, clients should consider aligning their specifications with actual performance needs. Our management systems are designed to support smarter specification strategies that reflect operational reality — not assumption.

Putting classifications to the test

To ensure our classifications and product performance align with industry standards, ECE UK has now worked with BSRIA (Building Services Research and Information Association) to conduct rigorous tests.

Through comprehensive testing based on the BS EN 1886:2007 standards, we measure the performance of both T2/TB2 thermal classification and T4/TB4 AHU specification designs under a variety of controlled conditions.

Our testing results emphasise that while T2/TB2 configurations are seen as necessary in healthcare settings, the T4/TB4 specifications perform admirably in thermal classification HVAC systems in retail and commercial contexts. (as shown in Figure 5)

For instance, testing has demonstrated that T4/TB4 units maintain effective humidity control, air handling unit performance, and air quality without condensation under typical operating conditions — highlighting their suitability without the associated costs of higher classifications.

Figure 5: T2/TB2 thermal classification and T4/TB4 AHU specification

Figure 5: T2/TB2 thermal classification and T4/TB4 AHU specification

Matching classifications to reality

Ultimately, the key takeaway is that understanding thermal classifications, such as T2/TB2 for healthcare projects and T4/TB4 for commercial and retail applications, is essential for optimising both system performance and budget.

By carefully evaluating when and where to apply these specifications, we can deliver solutions that meet and exceed client expectations while remaining cost-effective.

At ECE UK, our commitment is to provide efficient, high-quality air-handling solutions tailored to the unique demands of each project. By harnessing the guidance of BS EN 1886:2007 and conducting thorough testing with BSRIA, we ensure our products are not only innovative but also practical and aligned with real-world applications.

As we continue to navigate the complexities of HVAC system design, our focus remains on achieving the right balance between performance, cost, and suitability for every environment—be it in healthcare, commercial, or retail settings.

FAQS: Navigating thermal classifications in healthcare and commercial projects

In this document we refer to thermal classifications in BS EN 1886 that relates to air handling units that support building projects. BS EN 1886 doesn’t cover the buildings themselves and just refers to an AHU.

Proper thermal classification ensures comfort, safety, and energy efficiency. In healthcare, it is critical for patient well-being and infection control, while in commercial projects, it supports occupant comfort and operational cost savings.

Healthcare facilities often have stricter thermal requirements due to the need for infection control, sensitive equipment, and patient recovery. Commercial buildings typically focus on occupant comfort and energy efficiency, with more flexibility in temperature and humidity ranges.

Key factors include the building’s purpose, occupancy patterns, equipment loads, regulatory standards, and specific functional needs of each space (e.g., operating rooms vs. office spaces).

Both healthcare and commercial projects must comply with building codes and standards that dictate minimum thermal performance, ventilation rates, and environmental controls to ensure safety and efficiency.

Challenges include balancing energy efficiency with occupant comfort, integrating new technologies, addressing diverse space requirements, and ensuring compliance with evolving regulations.

What are common challenges in navigating thermal classifications?

Contact our team today

Get straight through to one of our engineers and start discussing the needs of your new air handling unit. Our team are on hand to work out a custom solution for you and your project. Just call 01634 729 690 or send us an email at sales@eceuk.com to get started.

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]]> Benefits of Intelligent Fabric Protection Systems https://www.eceuk.com/knowledge-hub/blog/the-benefits-behind-intelligent-fabric-protection/ Tue, 29 Jul 2025 14:12:06 +0000 https://www.eceuk.com/?p=3162 The post Benefits of Intelligent Fabric Protection Systems appeared first on ECE UK.

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The Benefits Behind Intelligent Fabric Protection

In today’s energy-conscious building landscape, protecting structural integrity while maintaining energy efficiency has become a critical challenge for facility managers and building owners. ECE UK Ltd’s innovative approach addresses this challenge through advanced building intelligent fabric protection systems that safeguard properties during unoccupied periods without compromising on energy performance.

What is Intelligent Fabric Protection and Why Is It Needed?

Intelligent Fabric Protection represents a revolutionary core feature of ECE UK’s Intelligent Energy Control system, specifically engineered to prevent building fabric damage and equipment degradation during non-occupancy periods in unmonitored buildings without full BEMS (Building Energy Management Systems).

This sophisticated building fabric protection system integrates seamlessly with energy-efficient, heat recovery ventilation units and operates through Trend IQ4 controller technology. The system ensures internal conditions remain above critical temperature thresholds without relying on conventional frost coil heating methods, delivering superior fabric integrity maintenance with optimal energy efficiency.

The Critical Need for Protection

Numerous studies by prestigious UK institutions, including University College London (UCL) and Loughborough University, have documented the severe structural and health-related impacts of sustained low indoor temperatures in buildings. The UCL Institute for Environmental Design and Engineering specifically recommends maintaining indoor temperatures above 14°C in unoccupied buildings to prevent moisture accumulation and structural damage, as outlined in their comprehensive Cold Homes Report (2020).

Public Health England and BRE further advise maintaining a minimum threshold of 18°C for optimal building fabric protection and occupant health, emphasising the importance of proactive low energy building protection strategies.

Benefits of Using Intelligent Fabric Protection

ECE UK’s Intelligent Fabric Protection system delivers multiple advantages that set it apart from traditional building protection methods:

Benefits of Intelligent Fabric Protection Systems

Prevents Structural and Surface Damage

The system maintains temperatures consistently above condensation thresholds, providing comprehensive protection for wall finishes, M&E infrastructure, and ceiling voids. This proactive approach to frost damage prevention ensures long-term structural integrity while minimising maintenance costs.

Protects Critical AHU Components

By preventing freezing or overcooling of DX coils, filters, and fan assemblies, the system significantly extends equipment lifespan. This air handling unit control capability reduces costly equipment replacements and ensures consistent system performance.

Dramatically Reduces Energy Consumption

The intelligent sampling approach eliminates the need for continuous fan and heater operation, delivering substantial energy savings compared to traditional systems. This heat recovery ventilation integration optimises energy usage while maintaining protection standards.

Benefits of Intelligent Fabric Protection Systems

Perfect for Non-BEMS Buildings

Designed specifically for standalone operation in small to mid-sized facilities lacking full building management systems, the solution provides enterprise-level protection without complex infrastructure requirements.

Risks of Low Indoor Temperatures

Understanding the consequences of inadequate temperature control is crucial for building owners and facility managers. The following temperature guidelines highlight critical protection thresholds:

Temperature Range Recommendation Risks of Falling Below
19-21°C Target temperature range for occupied spaces, as per UCL and CIBSE guidelines Temperatures below this range may lead to occupant discomfort and potential health issues
14-18°C Minimum recommended temperature during unoccupied periods for building fabric protection Sustained temperatures below 14°C result in condensation, dampness, and structural damage
Below 14°C Not recommended Increased condensation risk in buildings, mould growth, and deterioration of building materials

Primary Risk Factors

Condensation and Moisture Accumulation: When internal air temperatures fall below dew point, condensation forms on walls and surfaces, leading to damp conditions, mould growth, and decay of finishes and fittings. This condensation risk in buildings can result in significant remediation costs and health hazards.

Freeze-Thaw Structural Degradation: Cold masonry and concrete suffer microfracturing due to freeze-thaw cycles, particularly problematic in unheated or intermittently used buildings. This structural damage can compromise building integrity over time.

Mechanical Plant Damage: Cold temperatures within plant areas can damage coils, crack pipework, or seize components within air handling units, leading to expensive repairs and system downtime

How ECE UK’s Intelligent System Works

ECE UK’s Intelligent Energy Control system revolutionises traditional building protection through dynamic, energy-conscious control sequences that replace outdated static frost coil methods:

Advanced Control Features

Scheduled Night-Time Monitoring: The air handling unit activates briefly every 2 hours (or user-defined intervals) during unoccupied periods, ensuring consistent monitoring without continuous energy consumption.

Precision Return Air Temperature Sampling: The return air temperature sensor operates the unit for approximately 10 minutes to assess internal conditions accurately, providing real-time data for informed decision-making.

Condition-Based Operation: When return air temperature exceeds the non-occupied temperature setpoint (typically 14-16°C), the unit automatically shuts down to conserve energy, demonstrating intelligent air handling unit control.

Adaptive Fabric Protection Activation: If temperatures fall below the predetermined setpoint, the system continues operating to gently reheat the space until safe thresholds are restored, ensuring continuous fabric integrity maintenance.

The Benefits Behind Intelligent Fabric Protection

This sophisticated control logic operates directly through the Trend IQ4 controller, eliminating the need for dedicated BEMS or costly heating hardware like mechanical frost coils.

Real-World Applications

The system excels in diverse building types and operational scenarios:

  • Education Buildings: Providing protection during holiday periods when buildings remain unoccupied for extended periods
  • MOD and Defence Buildings: Managing intermittent occupancy patterns while maintaining security and structural integrity
  • Commercial Sites: Supporting part-time operations with energy-efficient protection protocols
  • Coastal and Rural Properties: Protecting against night-time frost in challenging environmental conditions

Benefits of Intelligent Fabric Protection Systems

Conclusion

ECE UK Ltd’s Intelligent Fabric Protection represents a paradigm shift in building protection technology, offering a proactive, energy-efficient safeguard that helps building owners avoid costly damage and deterioration. As an integral component of our comprehensive Intelligent Energy Control system, it combines intelligent software with our advanced PXA, RXA, and RAC air handling units to deliver unmatched resilience without operational complexity.

The system’s ability to maintain optimal fabric integrity maintenance while minimising energy consumption makes it an essential solution for modern buildings seeking sustainable, intelligent protection. By leveraging advanced heat recovery ventilation technology and sophisticated air handling unit control systems, property owners can ensure long-term structural protection while meeting today’s stringent energy efficiency requirements.

For building owners seeking comprehensive protection solutions, ECE UK’s approach demonstrates how intelligent technology can transform traditional building management challenges into opportunities for enhanced performance and reduced operational costs. Contact our team to learn more about implementing air handling unit maintenance solutions that deliver lasting value and protection.

Contact our team today

Get straight through to one of our engineers and start discussing the needs of your new air handling unit. Our team are on hand to work out a custom solution for you and your project. Just call 01634 729 690 or send us an email at sales@eceuk.com to get started.

our enquiry form

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]]> Combatting Elitism in the Air Handling Unit Sector https://www.eceuk.com/knowledge-hub/blog/how-ece-uk-combat-brand-elitism-air-handling-unit-sector/ Tue, 29 Jul 2025 13:04:39 +0000 https://www.eceuk.com/?p=3153 The post Combatting Elitism in the Air Handling Unit Sector appeared first on ECE UK.

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Empowering clients through inclusivity: How ECE UK Ltd combat brand elitism in the air handling unit sector

In today’s competitive marketplace, brand elitism has emerged as a significant concern for businesses aiming to connect with their clients on a deeper level. This phenomenon, where air handling system suppliers create an aura of superiority that leaves customers feeling inferior, can foster a harmful environment that leads to dissatisfaction and disengagement.

ECE UK Ltd, a family-run business specialising in air handling units, recognises the dangers of elitism in the air handling unit sector and is dedicated to counteracting its effects through a culture of inclusivity, empowerment, and engagement.

Combatting Elitism in the Air Handling Unit Sector

Understanding brand elitism: Impact of elitist HVAC brands on customer experience

Brand elitism manifests when businesses position themselves as superior, creating a hierarchy that customers feel pressured to conform to. This can lead to several detrimental outcomes:

  • Role reversal: Instead of brands serving their customers’ needs, clients may feel as though they are constantly validating their worth through association with an overpowering brand. Such a dynamic can breed resentment and disconnection.
  • Customer submissiveness: Consumers may become hesitant to express their preferences or explore alternatives, feeling that the branded product is the only viable option that aligns with their perceived status.
  • Limited choices: By fostering an image of exclusivity, premium air handling unit brands can create an illusion of limited options, stifling individual preferences and discouraging customers from seeking products that may offer better value.
  • Sustainability of loyalty: Initial allure can fade. If customers feel undervalued, they are likely to seek brands that foster inclusivity and a sense of community, jeopardising long-term loyalty for elitist brands.

Recognising these pitfalls, ECE UK Ltd emphasises an inclusive culture that not only empowers its employees but also enriches the customer experience.

Fostering a positive work environment

Family-run businesses like ECE UK Ltd often exhibit clear advantages when it comes to nurturing an empowering workplace culture. Their approach includes several key strategies:

1. Shared values and vision

At the heart of ECE UK Ltd is a profound commitment to shared values, which are consistently articulated and embodied by family members. This creates a unified sense of purpose among employees, encouraging them to engage deeply with the organisation’s mission. When staff identify with the core values, they are more motivated to contribute toward collective success.

2. Inclusive practices and team dynamics

The hiring practices at ECE UK Ltd promote diversity and inclusivity, which are instrumental in drawing varied perspectives that improve decision-making. The company also prioritises team-building activities, fostering collaboration and camaraderie. Such an inclusive environment not only enhances employee morale but also translates to a more effective, customer-focused service, addressing many common air handling supplier issues.

3. Customer-centric focus

ECE UK Ltd encourages employees to cultivate personal relationships with clients. By understanding customer needs and preferences, the team can provide custom air handling units and solutions that exceed expectations. The company’s leadership maintains open communication channels, ensuring that customer feedback is valued and acted upon, thereby cultivating loyalty and repeat business.

Client-centric air handling solutions

By deliberately counteracting brand elitism, ECE UK Ltd has created an empowering environment that values both employees and clients. Their commitment to shared values, employee recognition, inclusivity, and customer-centric practices not only helps mitigate the negative impacts of elitism but also enhances customer satisfaction and loyalty.

In a landscape where many air handling unit manufacturers prioritise exclusivity, ECE UK Ltd stands out by fostering genuine connections and delivering transparent pricing and tailored air ventilation solutions. Building a culture that uplifts both employees and customers can lead to lasting relationships and a thriving business in the competitive air handling unit sector.

Combatting Elitism in the Air Handling Unit Sector

Why UK businesses trust AHU suppliers like ECE UK Ltd

ECE UK Ltd has positioned itself as a trusted partner in the air handling unit sector by focusing on people-first values. In contrast to many premium air handling unit brands, ECE believes in collaboration, openness, and long-term relationships.

By offering custom ventilation systems, personalised support, and ongoing air handling unit maintenance, they’ve become a go-to choice for businesses across various industries.

Whether you’re navigating HVAC brand comparison, exploring air handling unit market segmentation, or searching for reliable air handling units, ECE UK Ltd is a model of sustainable success, grounded in inclusivity, not elitism.

Contact our team today

Get straight through to one of our engineers and start discussing the needs of your new air handling unit. Our team are on hand to work out a custom solution for you and your project. Just call 01634 729 690 or send us an email at sales@eceuk.com to get started.

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]]> 45 Years of Air Handling Excellence https://www.eceuk.com/knowledge-hub/blog/45-years-of-innovation-air-handling-excellence/ Mon, 28 Jul 2025 14:19:29 +0000 https://www.eceuk.com/?p=3047 The post 45 Years of Air Handling Excellence appeared first on ECE UK.

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45 Years of Innovation: Honing the Details that Drive Air Handling Excellence

For over four decades, ECE UK has been more than just an air handling units manufacturer of air handling units and advanced control systems — we’ve been innovators, craftsmen, and trusted partners to countless clients across the HVAC systems UK industry. Our 45-year journey has been one of continual improvement, practical ingenuity, and a deep commitment to the finer details that make all the difference in commercial HVAC solutions.

We understand that in HVAC system efficiency, it’s the small detail that counts. That principle underpins everything we do — from how we design our equipment to how we support our customers through the entire lifecycle of an AHU with integrated BMS systems.

45 Years of Air Handling Excellence

Honing Our Skills, Building Confidence

Since our inception, we’ve been refining our skills to deliver smarter, more reliable solutions through innovative AHU design innovation. Experience has taught us that efficiency doesn’t just come from high-performance components — it comes from clever design, intuitive interfaces, and reducing complexity on site for enhanced HVAC service access.

Whether it’s cutting installation time or simplifying air handling unit maintenance, every product we deliver reflects 45 years of accumulated insight in energy-efficient ventilation and building energy management systems (BEMS).

Why Detail Matters in Modern AHU Manufacturing

Over the years, our team has developed a suite of technical enhancements that solve real-world problems and improve operational outcomes in industrial air handling. Our focus on precision engineering and energy-saving HVAC systems has led to breakthrough innovations that set new standards in the industry.

Technical Innovation with Purpose

Over the years, our team has developed a suite of technical enhancements that solve real-world problems and improve operational outcomes. A few highlights include:

  • Easyshift Fan Rail System – A telescopic system allowing fans to be moved seamlessly from inside to outside the AHU for maintenance or replacement. This innovative approach to air handling maintenance is all about making the journey easier for service technicians.
Figure 1: Easyshift Fan Rail System
Figure 1: Easyshift Fan Rail System
  • Asset Tag – A digital gateway to all technical data related to your AHU and control systems. Whether you’re commissioning, servicing, or upgrading, Asset Tag ensures information is always at your fingertips throughout the unit’s lifecycle, supporting comprehensive HVAC maintenance protocols.
Figure 2 - Asset Tag (1)
Figure 2 – Asset Tag
  • Buy Parts and Spares via QR Reader – Smart, on-site access to critical components for commercial HVAC solutions. Scan, order, and get back to work — it’s that simple and revolutionises traditional air handling maintenance approaches.
Figure 3 - Access details to critical components
Figure 3 – Access details to critical components
  • Plug and Socket Controls – Pre-wired, pre-tested, and packaged with the AHU to reduce on-site wiring time and eliminate installation errors. These advanced control systems integrate seamlessly with existing building energy management systems (BEMS).
Figure 4: Plug and Socket Controls
Figure 4: Plug and Socket Controls

AHU Performance and Reliability

Our commitment to superior performance is demonstrated through rigorous testing and innovative construction methods that ensure long-term reliability in demanding commercial environments.

  • Frameless Construction – Independently tested by BSRIA to meet TB2 and T2 performance standards, our frameless construction provides robust, efficient solutions without compromise. This innovative approach to AHU design innovation delivers superior HVAC system efficiency while reducing material usage.
Figure 5: Frameless Construction
Figure 5: Frameless Construction
  • Compression Latches with Adjustable Hinges – On-site adjustments improve air tightness and ensure the unit performs as designed, even under challenging conditions. These features are crucial for maintaining optimal performance in energy-saving HVAC systems.
Figure 6: Compression Latches with Adjustable Hinges
Figure 6: Compression Latches with Adjustable Hinges
  • Colour-Coordinated Magnehelic Gauges – Instant visual distinction between clean and dirty filters enhances operational efficiency. It’s all about clarity and speed for the engineer when managing air handling maintenance schedules.
Figure 7 - Colour-Coordinated Magnehelic Gauges 
Figure 7 – Colour-Coordinated Magnehelic Gauges

Key Features of Bespoke Air Handling Units

Our bespoke approach to manufacturing ensures that every air handling unit meets the specific requirements of each project, incorporating cutting-edge technology and user-focused design elements.

Enhanced Service Access and Safety Features

  • Service Corridors with Full Task Lighting and Emergency Exits — We don’t just build AHUs; we consider how engineers interact with them, especially during critical maintenance tasks. These features exemplify our commitment to superior HVAC service access.
Figure 8: Service Corridors with Full Task Lighting and Emergency Exits
Figure 8: Service Corridors with Full Task Lighting and Emergency Exits
Figure 9: Service Corridor with Spare Fan Rack and Filter Shelving
Figure 9: Service Corridor with Spare Fan Rack and Filter Shelving
  • High-Level Harness Points on Roofs – Designed to reduce scaffolding needs when installing IP65 roof systems, saving installers both time and cost. This innovation demonstrates our understanding of practical challenges in industrial air handling installations.
Figure 9: High-Level Harness Points on Roofs
Figure 9: High-Level Harness Points on Roofs
Figure 10: Integrated Control Systems
Figure 10: Integrated Control Systems

Integrated Control Systems, Built In-House

We pride ourselves on being one of the few manufacturers that write the software and build the hardware ourselves. From bespoke Trend BEMS to Mitsubishi OEM-integrated PAC systems, our control strategies are finely tuned to the specific requirements of every project.

Our integrated BMS systems represent the pinnacle of advanced control systems technology. Because our controls are developed and tested in-house, our clients benefit from tighter integration, faster deployment, and energy-efficient ventilation systems that simply work better — right out of the box.

Figure 11: Advanced control systems technologyFigure 11: Advanced control systems technology

Figure 11 and 12: Advanced control systems technology

45 Years of Air Handling Excellence

Showcasing Our Achievements

As we mark 45 years in the HVAC systems UK industry, we’re not just looking back — we’re looking forward. Our innovations are designed to meet the future head-on: smarter integrated BMS systems, lower carbon footprints through energy-saving HVAC systems, easier installations, and enhanced user experiences in commercial HVAC solutions.

Every enhancement, from plug-and-play controls to QR-code-driven support, speaks to a single vision: to make the engineer’s journey easier, the building manager’s decisions smarter, and the tenant’s environment healthier through superior HVAC system efficiency.

Our expertise in industrial air handling, combined with decades of innovation in energy-efficient ventilation and building energy management systems (BEMS), positions us as the leading air handling units manufacturer for clients who demand excellence.

If you’re ready to work with a partner who obsesses over the details and delivers on decades of innovation in AHU design innovation and air handling unit maintenance, let’s start the conversation.

Contact our team today

Get straight through to one of our engineers and start discussing the needs of your new air handling unit. Our team are on hand to work out a custom solution for you and your project. Just call 01634 729 690 or send us an email at sales@eceuk.com to get started.

our enquiry form

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]]> Enhancing Indoor Air Quality and Occupant Wellbeing through Efficient Filtration https://www.eceuk.com/knowledge-hub/blog/improve-indoor-air-quality-3-stage-filtration/ Mon, 14 Jul 2025 09:29:53 +0000 https://www.eceuk.com/?p=2959 The post Enhancing Indoor Air Quality and Occupant Wellbeing through Efficient Filtration appeared first on ECE UK.

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Rethinking Filtration: The Power of Three in Two

Traditionally, improving IAQ meant bolting on extra filters which meant increased resistance and more maintenance. ECE UK’s approach simplifies without compromise. Our 2-stage system features:

  • A pre-filter Airpanel Select to capture large particulates like dust and pollen.
  • A secondary Carboactiv Pocket with combined ePM1 60% or 80% particulate + activated carbon filter —targeting fine particles and gaseous pollutants including VOCs and odours.

By integrating particulate and gas-phase filtration into one filter element, system resistance is reduced, maintenance is simplified, and energy performance is improved—all while enhancing indoor air quality.

Enhancing Indoor Air Quality and Occupant Wellbeing through 3-Stage Filtration

Enhancing Indoor Air Quality and Occupant Wellbeing through Efficient Filtration
Figure 1 MANN+HUMMEL Carboactiv Pocket

Integrated System Overview

Indoor air quality (IAQ) significantly influences health, comfort, and productivity. Implementing a 2-stage filtration system in packaged air handling units comprising a Pre-filter Airpanel Select and Secondary filter Carboactiv Pocket (Figure 1), can substantially improve IAQ. This guide presents technical insights, supported by empirical data and studies from UK and international institutions, demonstrating the benefits of such systems on cognitive function and respiratory health.

With the spotlight on indoor air quality (IAQ) more intense than ever, the building services sector is responding with innovation.
Facilities managers, HVAC engineers, and building designers now recognise IAQ as foundational elements of occupant health, cognitive performance, and energy efficiency. ECE UK is at the forefront of this transformation with a smart, integrated solution that combines 3-stage filtration into two stages. The two stages not only provide fine particle filtration but also gas adsorption in one filter element. By combining a fine filter with gas adsorption not just reduces the AHU footprint but further reduces capital cost, and running costs compared to traditional fine filtration and separate gas adsorption systems.

Cumulative Efficiency and Its Role in Improving Indoor Air Quality

Cumulative efficiency describes how multiple filters work together to enhance air quality. When filters are arranged in stages, each one captures pollutants the previous stage did not, resulting in a compounded cleaning effect.
This means the overall air cleaning performance is greater than any single filter alone. It allows systems to:

  • Remove a broader range of pollutants
  • Achieve higher air purity standards
  • Improve respiratory health and cognitive performance

Below is the filtration efficiency graph (Figure 2) for the combination of an Airpanel Select Coarse 80% filter followed by an Carboactiv Pocket ePM1 60% filter:

  • Red bars: Individual efficiency of the Airpanel Select filter
  • White bars: Efficiency of the Carboactiv Pocket filter
  • Blue bars: Combined cumulative efficiency for each particle size (PM10, PM2.5, PM1). This configuration shows strong cumulative performance, particularly in the PM2.5 range, reaching up to around 76% cumulative efficiency.
Enhancing Indoor Air Quality and Occupant Wellbeing through 3-Stage Filtration
Figure 2 Filtration Efficiency Graph

Respiratory Health Gains

IAQ upgrades also produce tangible health improvements. Across a sample of schools and workplaces, incidence rates of asthma symptoms, allergic reactions, and respiratory infections decreased by 30–50% post-implementation thus, enhanced filtration systems contribute to better respiratory health:

  • Hospital Settings: A study in a UK hospital ward found that supplementary air filtration significantly reduced airborne particulate matter, particularly in sizes associated with respiratory viruses, indicating a potential to lower infection risks.
  • Asthma and VOCs: Research at the University of Leicester is exploring the relationship between indoor VOC exposure and asthma severity, highlighting the importance of VOC removal in managing respiratory conditions.

Breathe Better: More Air, Intelligent Energy Control

Ventilation remains a cornerstone of clean air. ECE UK units are engineered to support increased Air Changes Per Hour (ACH), improving dilution of indoor contaminants. For example, raising ACH from 3 to 6 in classrooms and offices can cut airborne pathogen levels by more than 50%, with measurable impacts on cognitive function and wellbeing.

Combine that with Intelligent Energy Controls and efficient filtration, and the result is a dynamic ventilation system that adjusts airflow in real time using live data from CO₂, VOC, and PM sensors. It’s smart, reactive, and efficient delivering the air you need, when and where it’s needed.

Enhancing Indoor Air Quality and Occupant Wellbeing through 3-Stage Filtration

Data-Driven Health and Efficiency

ECE UK’s integrated approach doesn’t just improve air quality—it improves people and performance.

In a recent deployment:

  • CO₂ levels dropped from >1300 ppm to <700 ppm
  • PM2.5 concentrations fell by over 60%
  • VOCs were reduced by 70%
  • Sick days dropped by up to 25%
  • Cognitive test scores rose by 15%
  • HVAC energy consumption was cut by 15%
Enhancing Indoor Air Quality and Occupant Wellbeing through 3-Stage Filtration
Figure 3 Environmental & Operational Graph
Enhancing Indoor Air Quality and Occupant Wellbeing through 3-Stage Filtration
Figure 4 Cognitive Function Gains

These aren’t projections—they’re real outcomes, backed by case studies and visualised through clear dashboards and performance reports delivered via Intelligent Energy Controls in partnership with Trend BEMS.

Studies indicate that improved IAQ through effective filtration enhances cognitive performance:

  • Student Performance: A randomised double-blind crossover study demonstrated that air purification led to significant improvements in test scores among students, suggesting enhanced cognitive function.
  • Workplace Productivity: Research by the Grantham Research Institute estimate that reducing indoor PM2.5 levels led to productivity gains, with potential economic benefits up to £40 billion annually in the UK.

Backed by Science

ECE UK’s strategy aligns with leading research from UK and European universities. Contributions from the University of Nottingham helped shape ASHRAE Standard 241. Research at Leeds confirmed sensor-based air quality monitoring in schools is effective in limiting airborne transmission of illness.

Implementing advanced filtration aligns with emerging standards:

  • University of Leeds Study: Research into air cleaners in schools aims to assess their effectiveness, supporting the case for enhanced filtration in educational settings. 

Making Buildings Smarter—and Safer

As the line between building performance and human performance continues to blur, the message is clear: smarter IAQ is no longer a luxury—it’s a necessity. With ECE UK’s combined 2-stage filtration system, and Intelligent Energy Controls integration, we deliver a futureproof solution that meets today’s challenges and tomorrow’s expectations.

References

  1. Environmental Science & Technology: “Reducing Indoor Particulate Air Pollution Improves Student Test Scores” (ACS Publications)
  2. Grantham Research Institute: “Tackling indoor air pollution could save UK up to £40 billion a year” (LSE)
  3. University of Leicester: “Indoor Air Quality study at the University of Leicester” (Lasting Health)
  4. University of Nottingham: “Nottingham academic plays part in world first air quality standard” (University of Nottingham)

Contact our team today

Get straight through to one of our engineers and start discussing the needs of your new air handling unit. Our team are on hand to work out a custom solution for you and your project. Just call 01634 729 690 or send us an email at sales@eceuk.com to get started.

our enquiry form

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]]> Understanding Systems with Pressure Relief Damper and 3 Way Air Mixing Plenums https://www.eceuk.com/knowledge-hub/blog/pressure-relief-damper-and-3-way-air-mixing-plenums/ Fri, 11 Jul 2025 11:40:08 +0000 https://www.eceuk.com/?p=3319 The post Understanding Systems with Pressure Relief Damper and 3 Way Air Mixing Plenums appeared first on ECE UK.

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Gravity or pressure relief damper (PRD)

The Gravity Damper schematic (Figure 1), with pressure relief being the focus, working alongside a Supply Secondary Air Unit (SSAU), can maintain good indoor air quality and pressure equilibrium in an HVAC system—i.e., ensuring the area served is not over-pressurised.

Understanding Systems with Pressure Relief Damper
Figure 1: Pressure Relief Damper Schematic
Figure 2 Gravity or Pressure Relief Damper
Figure 2 Gravity or Pressure Relief Damper

Gravity damper mechanism

By utilising gravity-operated relief dampers (Figure 2), it effectively allows for excess air to be released from the building when the indoor pressure exceeds the outdoor pressure, thus preventing over-pressurisation.

Key features and functions

Automatic response

The damper’s blades automatically adjust based on the pressure difference between indoor and outdoor air.

  • When the indoor pressure exceeds the outdoor pressure (positive pressure), the relief blades open, allowing excess air to escape.
  • Under negative pressure, the blades seal shut to prevent uncontrolled outside air infiltration

The exact response of the fresh air damper and recirculation damper (Figure 3) depends on the control logic and sensor inputs. For instance, the fresh air damper typically reduces outdoor air intake, while the recirculation damper opens more to maintain airflow and comfort within the AHU. The correct control logic implements a true/false scenario to lock or freeze the dampers when a pressure relief damper opens. Regular air handling unit maintenance is essential to ensure optimal damper performance and HVAC efficiency

Figure 3: Fresh Air and Recirculation Damper (SSAU)
Figure 3: Fresh Air and Recirculation Damper (SSAU)

Location

Positioned on the return air side of the fan, the AHU pressure relief damper ensures the indoor fan does not over-pressurise the space, avoiding discomfort, air quality degradation, or damage to HVAC system components.

Figure 4: Supply Secondary Air Unit (SSAU)
Figure 4: Supply Secondary Air Unit (SSAU)

Energy efficiency

It supports efficient HVAC airflow regulation by allowing controlled air release. When paired with Demand Control Ventilation (CO₂ control) and SSAUs (Figure 4), buildings can reduce energy usage by adjusting ventilation based on occupancy.

Demand Control Ventilation (CO2 Control) and Supply Secondary Air Units (Figure 4) can be used with a pressure relief damper; buildings can reduce energy consumption by adjusting ventilation based on occupancy rather than maintaining constant airflow. This adaptability leads to significant savings in heating, cooling, and ventilation energy use.

Simplicity and reliability

This passive mechanical device operates without additional power or complex systems, offering a dependable, low-maintenance solution for pressure control in HVAC.

Application

Gravity Damper systems are prevalent in mechanical ventilation systems for healthcare facilities, laboratories, cleanrooms, and data centres where air balancing dampers and pressure management are vital. They can be especially beneficial in buildings with high ventilation demands or varying occupancy levels.

Understanding Systems with Pressure Relief Damper and 3 Way Air Mixing Plenums

Benefits

  • Improved air quality: Prevents over-pressurisation to maintain healthier indoor environments with appropriate HVAC air distribution.
  • Comfort: Helps maintain consistent indoor conditions, leading to improved comfort for occupants.
  • System protection: Reduces stress on the HVAC system, prolonging the lifespan of components and minimising repair needs.

In summary, the pressure relief damper is vital for maintaining balanced air pressure, enhancing energy efficiency, and improving HVAC system balancing, all while supporting better air quality and occupant well-being.

Incorrect Positioning of Exhaust Fan with a 3 Way Air Mixing Plenum

The Exhaust Fan and 3 Way Air Mixing schematic (Figure 5), shows the fan positioned on the negative side of an SSAU. This set up won’t maintain good indoor air quality and pressure equilibrium in a HVAC system i.e., pressure dynamics, air flows, and control mechanisms are critical to efficient operation of this system otherwise units can fault on airflow and will prove difficult controlling temperature and fresh air quantity.

Figure 5: Exhaust Fan and 3 Way Air Mixing Schematic
Figure 5: Exhaust Fan and 3 Way Air Mixing Schematic
Figure 6: Exhaust Fan
Figure 6: Exhaust Fan

Pressure Dynamics

In this arrangement, a transition from 100% outside air to mixed air can create unintended airflow paths. As the outside air damper attempts to close while return air begins to flow in from the wrong direction, it can lead to a rise in building pressure. This situation results because the exhaust fan (Figure 6) draws from a lower pressure area (mixed air plenum), rather than directly from the building. Thus, if the outside air damper is not adequately controlled it can lead to incorrect airflow patterns.

Energy Efficiency with Exhaust Fan
Incorrectly Positioned

The following challenges occur with this design when installing Demand Control Ventilation (DCV) i.e., CO2 control.

Pressure imbalances

If the return air plenum experiences a more negative pressure than the design requires, it can cause unintended airflow patterns. This could lead to challenges for DCV systems, which rely on accurate sensing of air quality and occupancy to adjust ventilation rates effectively.

Response delays

DCV systems are typically designed to adjust ventilation rates based on real-time data from sensors (e.g., CO2 levels). If the economiser system improperly modulates the outside air damper due to pressure conditions, it may not respond quickly to changes in occupancy or air quality, leading to potential comfort issues or energy waste.

Inadequate air mixing

The high velocity and negative pressure conditions in the mixing plenum can hinder proper air mixing, a critical aspect of both recirculation and DCV. Without adequate air mixing, some areas of a space may receive insufficient ventilation, while others may become over-ventilated, negating the benefits of DCV.

Increased energy use

Poor design leading to excess pressure drops and inefficient airflow can significantly increase the energy required to operate the system, counteracting the energy-saving potential of both recirculation and DCV.

Negative pressure management

A well-designed system ensures that the pressure drop in the return plenum is less negative than that in the mixing plenum during recirculation operation for instance exhaust fan positioned so it pressurises the exhaust damper and recirculation damper (Figure 7). The return fan allows the supply fan to effectively draw return air without incurring excessive power losses. Proper pressure differentials are key to maintaining air plenum design integrity and indoor air quality.

In summary, while it is possible for poorly designed recirculation systems to work with DCV, their combined effectiveness will be suboptimal and may lead to inefficiencies and occupant discomfort. To achieve the intended benefits of both systems, it is essential to redesign the system to ensure proper pressure relationships, airflow patterns, and control integration, addressing the shortcomings typically associated with poor design. Ultimately, a thoughtful design approach can lead to a more efficient and responsive HVAC system that optimally utilises both free cooling strategies and demand control ventilation principles.

Figure 7: Exhaust fan pressurising the exhaust and recirculation dampers
Figure 7: Exhaust fan pressurising the exhaust and recirculation dampers
Figure 6: Exhaust Fan and 3 Way Air Mixing Schematic
Figure 6: Exhaust Fan and 3 Way Air Mixing Schematic

Correct Positioning of Exhaust Fan with a 3 Way Air Mixing Plenum

The Exhaust Fan and 3 Way Air Mixing schematic (Figure 6), shows the fan positioned on the positive side of an SSAU or Supply & Extract Unit 3 Way Mix (SEU3MX). This set up can maintain good indoor air quality and pressure equilibrium in a HVAC system.

If provided with demand control ventilation (DCV), the correct sizing and design of the supply and return ducts are critical for optimising performance and maintaining acceptable indoor environmental quality. Below is an overview and key design considerations involved in managing supply and return airflows within such a system, particularly regarding exfiltration and its impact on space pressure.

Overview

A return fan positioned on the positive side of return damper (Figure 7) employs the return air to promote energy efficiency by reusing existing conditioned air, particularly when outdoor conditions are favourable for cooling or ventilation. Coupled with demand control ventilation, this system effectively optimises indoor air quality while minimising energy costs.

Figure 7: Exhaust Fan with Recirculation and Exhaust Damper
Figure 7: Exhaust Fan with Recirculation and Exhaust Damper

Understanding Systems with Pressure Relief Damper

Key Design Considerations

Maximum Airflow Capacity

Supply and Return Duct Design: The supply and return ducts should be sized to handle the maximum supply and return airflows (in metres cubed per second, or m3/s) the system is intended to accommodate. This ensures that there is sufficient capacity for airflow, particularly during peak demand conditions.

Exfiltration

Definition and Impact: Exfiltration is the process by which conditioned air leaks out of the building through openings in walls, around doors, windows, and other structural components. The amount of air that can exfiltrate largely depends on:

  • The space static pressure: Higher pressure differential leads to increased exfiltration rates.
  • Building construction: Materials, construction quality, and air sealing techniques directly influence the permeability of the building envelope, affecting how much air escapes.

Space Pressure Management

Maintaining Acceptable Space Pressure: It’s vital to maintain a balanced indoor air pressure to avoid negative (or positive) pressure conditions that could lead to issues such as:

  • Air quality problems, whereby pollutants may enter from outside or from adjoining spaces due to pressure differences.
  • Unintended thermal losses.
  • Increased energy consumption from HVAC systems trying to compensate for inflation/deflation of the building envelope.

Benefits

Correctly positioning the return fan in a 3 Way Air Mixing Plenum designed for demand control ventilation (DCV) applications offers several significant benefits in terms of energy efficiency, indoor air quality, comfort, and operational flexibility. Below is a detailed look at these advantages:

1. Energy Efficiency

  • Reduced Energy Consumption: By utilising return air for minimising reliance on mechanical heating and cooling when outdoor air conditions are favourable, the system can significantly lower energy use. This results in lower utility bills and a reduced carbon footprint.
  • Optimised Fan Operation: The system adapts fan operation based on occupancy and ventilation needs, allowing for reduced airflow when the space is under low demand, further conserving energy.
  • Free Cooling Opportunities: During cooler weather, the economiser can bring in fresh outdoor air, reducing or eliminating the need for mechanical cooling altogether, thus maximising the efficiency of the HVAC system.

2. Improved Indoor Air Quality (IAQ)

  • Enhanced Ventilation Control: DCV optimises the amount of fresh air introduced into the space based on actual occupancy and pollutant levels. This leads to better indoor air quality as it adjusts ventilation rates according to real-time needs.
  • Targeted Response to Pollutants: By monitoring CO2 levels or other air quality indicators, the system can provide increased ventilation during high occupancy, ensuring that indoor pollutants are effectively diluted.

3. Cost Savings

  • Lower Operating Costs: Decreased energy consumption translates directly to lower operating costs for HVAC systems, improving overall cost-effectiveness over time.
  • Reduced Equipment Wear and Tear: By allowing for lower levels of air conditioning when outdoor conditions permit, the life span of HVAC equipment may be extended due to less frequent operation under full load conditions.

4. Occupant Comfort

  • Consistent Temperature Control: Effective management of the airflow can result in improved temperature control, preventing hot or cold spots in the occupied space.
  • Proactive Response to Demand: Since the system adjusts based on actual attendance and occupancy, occupants receive adequate ventilation without unnecessary fluctuations in temperature or airflow, contributing to overall comfort.

5. Flexibility and Adaptability

  • Response to Varying Occupancies: DCV systems can quickly adapt to changes in occupancy levels, providing ventilation based on real-time data rather than relying on a static schedule, making them ideal for spaces with fluctuating use.
  • Scalability: These systems can be designed to easily accommodate changes in building layout, occupancy loads, or usage patterns without significant redesign, making them a flexible solution for dynamic environments.

Understanding Systems with Pressure Relief Damper

In summary an SSAU or SEU3MX system designed correct with demand control ventilation (DCV) applications provides a holistic approach to optimising HVAC performance while ensuring high indoor air quality and occupant comfort. These systems leverage energy-efficient practices and adaptive ventilation strategies to accommodate actual building needs, fostering a sustainable and responsive indoor environment. This makes them increasingly prevalent in good building designs focused on energy efficiency and occupant health. For high-performance solutions, partner with a trusted Air handling units Manufacturer offering modern HVAC technologies.

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]]> Should thermal wheels be used in healthcare? https://www.eceuk.com/knowledge-hub/blog/should-thermal-wheels-be-used-in-healthcare/ Fri, 11 Jul 2025 09:17:09 +0000 https://www.eceuk.com/?p=2949 The post Should thermal wheels be used in healthcare? appeared first on ECE UK.

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Thermal wheels, also known as rotary heat exchangers, are commonly used in HVAC systems for their high energy recovery ventilation performance. But their application in sensitive environments like operating theatres, isolation rooms, and clinical laboratories raises concerns due to strict air quality and infection control requirements.

Even though standards like HTM 03-01 may approve the use of thermal wheel heat recovery units in applications with filters designed to prevent microbiological contamination, there are important reasons why their use might still be discouraged or avoided in certain healthcare or sensitive environments.

Reasons to avoid thermal wheels in clinical settings

1. Regulatory and safety considerations

Healthcare facility guidelines often recommend against the use of energy recovery devices that allow for any potential cross-contamination. For example, NHS Scotland guidance permits thermal wheels in general wards but advises against their use in areas treating vulnerable patients.

Additionally, future changes in room usage—from general to specialised clinical functions—could necessitate the costly removal or replacement of thermal wheels to comply with stricter air quality standards.

To better understand the structure and potential leakage paths in thermal wheels, consider the following schematic:

For robust compliance with evolving requirements, many designers opt for safer, more controlled air handling units for healthcare sites that ensure long-term flexibility.

Explore air handling units for healthcare sites.

Figure 1 - Thermal wheel components
Figure 1 – Thermal wheel components
Figure 2 Microbiological contamination
Figure 2 Microbiological contamination

2. Risk of cross-contamination

Thermal wheels inherently allow a degree of air leakage between the exhaust and supply air streams. This leakage can occur through:

  • Carryover: Residual exhaust air retained in the wheel matrix and transferred to the supply air stream.
  • Seal Leakage: Imperfections or wear in the seals separating the two air streams.

Even with mitigation measures like purge sectors, studies have shown that cross-contamination can be reduced but not eliminated. For instance, a purge section can lower carryover contamination from approximately 2–4% to about 1% but cannot address leakage through peripheral and transverse seals.

In clinical environments, where patients may be immunocompromised or exposed to airborne pathogens, even minimal cross-contamination poses unacceptable risks to health and safety.

3. Reduced effectiveness of the purge sector

Issue: The thermal wheel relies on a specific airflow pattern to exhaust contaminated air during purge cycles. The purge sector uses a small stream of clean supply air to flush or “purge” the matrix before it rotates into the supply air stream. This purge air displaces trapped contaminants in the matrix and redirects them back into the exhaust airstream.

Impact: If the extract fan is not correctly set or if airflow is pushed in the wrong direction, the purge sector may be bypassed or rendered ineffective, compromising the system’s ability to flush out microbiological contaminants.

Figure 3 Specific airflow pattern for Purge
Figure 3 Specific airflow pattern for Purge
Figure 2 Microbiological contamination
Figure 2 Microbiological contamination
  • P21 = Static pressure, outside air
  • P22 = Static pressure, supply air
  • P11 = Static pressure, exhaust air
  • P12 = Static pressure, outlet air

This reinforces the importance of consistent and professional air handling unit maintenance across all HVAC systems in clinical settings.

4. Incorrect fan and exhaust configuration leading to cross-contamination

Issue: If the extract fan is positioned or controlled improperly—such as blowing air through the thermal wheel—it can disrupt the intended airflow patterns.

Impact: This may prevent the purge sector (the part of the wheel that exhausts contaminated air) from functioning effectively, leading to recirculation of contaminated air or backflow into the supply airflow. These risks violate core HVAC infection control standards.

5. Complexity in design and control

Issue: Thermal wheels require precise control of airflow rates, bypass dampers, and fan positions to operate correctly.

Impact: In complex or poorly designed systems, misconfiguration can lead to ineffective heat recovery and contamination risk, especially if staff are unfamiliar with the specific control strategies needed. This makes correct integration with air handling units crucial. Learn more about air handling units.

Figure 5 Thermal Wheel Storage Mass (Matrix)
Figure 5 Thermal Wheel Storage Mass (Matrix)

6. Challenges in cleaning and maintenance

The structure of thermal wheels includes a matrix of narrow channels designed for heat exchange. These channels can accumulate dust, biological contaminants, and other particulates over time. Cleaning these intricate components is labour-intensive and may not achieve the level of decontamination required in clinical settings.

Moreover, certain contaminants can adhere to the wheel’s surfaces, reducing its effectiveness and posing additional cleaning and maintenance challenges. This emphasises the importance of proper HVAC system maintenance in hospitals.

Alternative solutions

For specialised clinical areas, alternative heat recovery methods that ensure better separation of air streams are recommended:

  • Run-Around Coil Systems: Utilise a closed-loop fluid circuit to transfer heat between supply and exhaust air streams without mixing the air itself.
  • Plate Heat Exchangers: Employ solid barriers to separate air streams, reducing the risk of cross-contamination.

These systems, while potentially less energy-efficient than thermal wheels, prioritise patient safety and compliance with healthcare air quality standards. In the run-around coil vs thermal wheel debate, clinical safety often tips the balance in favour of separation-focused solutions.

Figure 6 General principle of rotary heat exchangers
Figure 6 General principle of rotary heat exchangers

Summary

While thermal wheels offer energy efficiency benefits, their potential for cross-contamination and maintenance challenges make them unsuitable for specialised clinical environments where air purity is paramount.

Although HTM 03-01 may approve thermal wheel heat recovery units with appropriate filters, the practical risks—such as incorrect extract fan positioning, improper airflow control, and potential for cross-contamination—can undermine their microbiological safety.

In critical healthcare environments, these issues outweigh the theoretical benefits, leading to a preference for alternative heat recovery methods and a more robust filtration strategy.

Contact our team today

Get straight through to one of our engineers and start discussing the needs of your new air handling unit. Our team are on hand to work out a custom solution for you and your project. Just call 01634 729 690 or send us an email at sales@eceuk.com to get started.

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