If the fan is operated by a manual switch then one has to make a conscious decision to operate that switch.
Light switch for light and extractor fan.
Extractor fans in bathrooms are frequently powered from a lighting circuit.
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Connect the black fan cable together with the black light wire and the black switch wire and.
3 push switch plus lights.
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However if there is a window but it does not open then there has to be another way to switch on the fan as well as the light switch in fact there is no requirement to have it connected to light switch so three main methods are 1 a simple push switch with built in timer.
Connect a light and a fan to a new switch.
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If the extractor is linked to the light then per my second point above one has to make a conscious decision to turn on the lights even if when lights are not needed during daylight hours in order for the extractor to operate.