Wiring in a bathroom extractor fan

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OK - position the temperature switch where any hot water use triggers the fan, then it will come on when he finishes and washes his hands.
 
Once I looked into making an H2Sstat - one that would turn a fan on automatically to vent noxious odours. I concluded that the human nose was far more sensitive than commercial hydrogen sulphide sensors and it would probably never operate.
 
What about installing a pir to activate the fan. Can you get a photocell type that wouldn't work after dark.
 
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What about installing a pir to activate the fan. Can you get a photocell type that wouldn't work after dark.
They usually work the other way around! ... but I suppose it's not impossible that such an animal exists.

Kind Regards, John
 
Or just put a b****y pull switch in and rely on the Mk I Organic Decision Making Processor to decide when to pull the string.
 

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