Look beyond the fan motor
An extraction system moves air out of the building. Its energy picture can include the fan and the building systems that replace and condition that air. The balance depends on the installation and how it operates.
Motor nameplate power is useful identification, but it is not a complete record of measured energy use. Keep it separate from meter readings and operating-hour records.
Create a baseline log
| Item | Record |
|---|---|
| Equipment | Cupboard, fan and controller identification. |
| Schedule | Occupied work, standby and other approved operating states. |
| Controls | How sash position and room systems affect airflow. |
| Measurements | Available electrical and ventilation data with dates and units. |
| Requirements | Process and safety conditions that must be maintained. |
Compare changes against the same conditions
Ask the facilities or mechanical team to state the assumptions behind any estimated saving. Keep weather, operating hours, airflow and heating or cooling requirements consistent when comparing options.
Our SashDrive energy-planning guide covers that model-specific option. The variable-volume guide explains the control principle, while make-up air planning covers the room-air interface.
Protect the approved operating requirements
Any control or schedule change should be reviewed with the responsible safety and building-services team. Agree the operating conditions, testing and user instructions before implementing it.
- Keep the original baseline and assumptions.
- Record the approved change and its date.
- Compare measured results over a suitable period.
- Review performance and operating requirements together.
This creates a useful record for future equipment decisions without relying on a generic savings percentage.