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How to check Fan Rotation Direction

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Before You Begin
  • Select Maintenance Mode and isolate the AHU before opening the fan section.
  • Confirm the fan has stopped completely before access.
  • Be ready to identify the airflow direction arrow on the fan casing.
  • Ensure the diaphragm plate and drag chain can be handled safely if fitted.
Quick Overview
  • Isolate the AHU and access the fan section safely.
  • Identify the airflow arrow and expected impeller rotation.
  • Run the fan at reduced speed for a controlled check.
  • Confirm rotation direction through the viewing point.
Keep This Guide On Hand

This guide shows how to visually verify correct fan rotation direction and airflow alignment using the manufacturer’s airflow arrow indicator. It supports safe commissioning and correct fan performance.

Video guide | 4 minutes 51 Seconds | Booklet included

Download Guide

Written Guide Overview

This written summary mirrors the booklet and gives users a quick reference to the key steps show in the video.

1
 Isolate the unit, open the fan section and, where fitted, withdraw the diaphragm plate carefully to the safe service position.
2
 Identify the airflow direction arrow and determine the correct impeller rotation needed to produce airflow in that direction.
3
 Refit the diaphragm plate, close the access door, and run the fan at low speed using the controller.
4
 Observe the impeller through the view port, confirm that rotation matches the airflow direction, and stop the fan if incorrect rotation is seen.
What this guide covers
  • Safe preparation before accessing the fan section.
  • Withdrawing and refitting the diaphragm plate where fitted.
  • Identifying the airflow direction arrow and reference rotation.
  • Running the fan at reduced speed for verification.
  • Correct vs incorrect rotation signs.
  • Final confirmation and return to normal operation.

Need further assitance?

If the portal does not load, re-check the internet connection, QR scan and 18-digit reference number. If access still fails, contact ECE support and quote the unit’s reference number. You can reach our team on 01634 729 690 or sales@eceuk.com.

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