Bathroom extractor fans: what a proper install should do
People search the Building Regulations because a fitter has waved at “Part F” or because the ceiling is already black in the corners. You do not need the full approved document. You need a fan that is the right size, ducted outside, and wired so it actually runs.
What good looks like
- —Extract to outside air, through a short, sensible duct
- —A run-on timer so it keeps going after you leave
- —Enough extraction for the room, not a token fan that whispers
- —A position that is not fighting the door and the window
- —Certification for the electrical connection
Windows are not a plan
An openable window helps, and in summer people use it. In a Burnley January they will not stand in a wet room with it wide open. Design for the season you actually shower in.
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Quick answers
Does a bathroom need an extractor fan?+
If there is no workable openable window, mechanical ventilation is the usual way to meet the need for extract. Even with a window, a fan is what actually gets used in winter.
Can the fan discharge into the loft?+
No. Moist air should leave the building. Dumping it into a cold loft is how you grow mould above the ceiling.
Who should fit the electrics?+
Bathroom electrical work, including a fan in the zones around a bath or shower, should be done by someone competent to certify it. We do not leave that as a DIY extra.
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