Wet rooms in our homes and buildings such as kitchens, bathrooms and utility rooms produce high levels of humidity and are therefore prone to condensation and black mould growth. The British Building Research Establishment (BRE) tagline states "Build tight, Ventilate right". It is important to provide some means of expelling the moist air along with any potentially unpleasant odours which may form in these areas. Electrical bathroom and kitchen extractor fans are a relatively cheap and easy to fit solution to quickly freshening a room without the potential for draughts.
Current F1 Building Regulations require all kitchens and bathrooms to have "adequate air extraction".
Types of fan
In general the main types of extractor fans available are:Axial extractor fans:
Usually mounted directly into a window or, using a short length of ducting, into an exterior wall.
Centrifugal extractor fans:
Often mounted into a ceiling, as these fans are able to overcome the air pressure resistance generated by long lengths of ducting.
Inline extractor fans:
Usually mounted above ceilings or in loft voids for aesthetic reasons or where no suitable wall or window surface is available
Common terms used to describe extractor fans:
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