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Old 09-26-2007, 06:47 PM   #1
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wiring a bathroom exhaust fan


Do they make a switch that senses humidity and will turn on a bathroom exhaust fan automatically? My wife and kids are apparently alergic to the fan switch and never seem to remember to turnon the fan.

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Old 09-26-2007, 06:52 PM   #2
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wiring a bathroom exhaust fan


you could wire in a line voltage humidistat but they tend to be extremely unreliable, you're better off wiring the fan into the lights for the shower.

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Old 09-26-2007, 07:05 PM   #3
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wiring a bathroom exhaust fan


The only problem I see what that is that they will shut the light off after they leave the batroom and the fan will stop...never mind, Im the only one who shuts off lights!
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Old 09-26-2007, 07:08 PM   #4
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wiring a bathroom exhaust fan


Maybe a motion sensor aimed at the shower area to turn the fan on/off?

My wife always remembers to turn the fan on.. As she is walking out of the bathroom and the mirror is covered in fog...
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Old 09-26-2007, 07:17 PM   #5
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wiring a bathroom exhaust fan


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Originally Posted by Tool Junkie View Post
The only problem I see what that is that they will shut the light off after they leave the batroom and the fan will stop...never mind, Im the only one who shuts off lights!

I see your point. Then put the fan on with the shower light and replace the switch with a 60 min spring wound timer.
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Old 09-26-2007, 11:16 PM   #6
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wiring a bathroom exhaust fan


There is a switch available with a timer component. Timer is hidden behind wallplate. It turns fan on when switch is turned on, and runs the fan for the set duration after the light is switched off.
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Old 09-27-2007, 01:35 PM   #7
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wiring a bathroom exhaust fan


A spring wound timer is the best bet. I had to use them when my daughter's were young. But 15 minutes is more than sufficient, unless you want to run the fan for longer.
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Old 09-27-2007, 02:30 PM   #8
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wiring a bathroom exhaust fan


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There is a switch available with a timer component. Timer is hidden behind wallplate. It turns fan on when switch is turned on, and runs the fan for the set duration after the light is switched off.
True, although the off delay switch will cost you $50+ wereas the spring wound timer will be under 10 bucks.
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Old 09-27-2007, 02:53 PM   #9
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wiring a bathroom exhaust fan


You could wire the exhaust fan in with the light switch so that when the light is turned on, the exhaust fan will come on also.
Of course, this idea is no good if the light is not needed (daytime).

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