Extractor fans/range hoods
Extractor fans quickly remove moist air from bathrooms, toilets and laundries. Range hoods do the same job for kitchens.
It's important to choose the right-sized fan for the job. A fan that's too small won't remove enough moist air to keep your home dry. A fan that's too large can create draughts. For a typical bathroom or toilet a ventilation rate of 25 litres per second should suffice. For more information see Table B1 in AS 166 part 2.
Extractor fans should be placed as close to the moisture source as possible. They must be vented to the outside or the moist air will end up in your roof space, damaging your insulation and roof supports (see Moisture for more).
Because extractor fans remove moist air but don't bring in fresh air to replace it, you'll need some other way of getting fresh air into the room. By placing air vents on the opposite side of the room from the extractor fan, or slightly opening doors or windows, you can encourage air flow.
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