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Choosing The Right Extractor Fan

Extractor fans work by reducing humidity levels to combat condensation and damp problems, improving the air quality. But with so many to choose from it can be confusing to find the right fan for particular environments.

Low Voltage

Required for installation in zones 1 and 2 of a bathroom – Zone 1 is the area above the bath up to a height of 2.25m, and Zone 2 is an area stretching 0.6m rom the perimeter of the bath up to 2.25m from the floor. If you’re fitting a fan within these areas, it must be low voltage.

Axial Fans

These are the most common type of fan and also the least expensive. They are less powerful and should only be fitted to a wall with direct access to the outside, as they shouldn’t be ducted more than 2-3m. Generally used in small bathrooms or toilets.

Centrifugal Fans

More powerful than axial fans, these are ideal for bigger spaces and longer duct runs. They are often seen in rooms without exterior walls or windows, and are more suited to commercial environments such as offices and warehouses.

Inline Fans

These can be installed in lofts or ceiling voids and are suited for ducting long distances, up to 40m. Inline fans look less obtrusive than wall mounted fans s they are not installed in the room from which they are extracting air, and are ideal for fitting above bathrooms or kitchens.



This measures the relative humidity of the air and will turn the fan on automatically once it reaches a pre-set level.


These fans can be timed to be left running for a set period of time and, most importantly, turned off to save energy – ideal for busy bathrooms.

PIR Sensor

These fans can be timed to be left running for a set period of time and, most importantly, turned off to save energy – ideal for busy bathrooms.


Typical dB measurements for axial bathroom fans range between 35dB and 45dB. However, some fans emit as low as 22dB. See our chart below for comparative examples.


Wednesday 13 March, 2019
Extractor Fans