Extractor fans in bathrooms are frequently powered from a lighting circuit.
Light switch for light and extractor fan.
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.
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Connect a light and a fan to a new switch.
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.
Using wire strippers peel an inch of insulation from the end of the black and white wires.
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If the fan is operated by a manual switch then one has to make a conscious decision to operate that switch.
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Connect the black fan cable together with the black light wire and the black switch wire and.