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Bath Fan Switch #209012 03/03/13 01:09 PM
Joined: Jan 2004
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George Little Offline OP
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Are residential bathroom fans required to be controlled by a switch?


George Little
2017 / 2014 NEC & Related Books and Study Guides
Re: Bath Fan Switch [Re: George Little] #209014 03/03/13 01:14 PM
Joined: Jul 2004
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gfretwell Online Content
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Not that I can think of ... assuming you can use the breaker for a disconnect.
It is not uncommon to see them on motion sensors.


Greg Fretwell
Re: Bath Fan Switch [Re: George Little] #209018 03/03/13 05:40 PM
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Posts: 1,273
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Tesla Offline
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Who, in a residence, could tollerate the HVAC drain that an unswitched fan would cause?

Just the noise, alone, would have the residents howling.


Tesla
Re: Bath Fan Switch [Re: George Little] #209019 03/03/13 06:18 PM
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Posts: 361
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mbhydro Offline
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I have seen them on humidistat's in the hall and go off and on as required depending on the whole house level and not just the bathroom. Doesn't do anything for getting rid of the smell though.

Re: Bath Fan Switch [Re: George Little] #209034 03/04/13 09:33 AM
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Posts: 2,233
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harold endean Offline
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In my 30 years of electrical experience, I have yet to see a bath fan NOT on a switch of some kind. Most of them go on with a light in the bathroom. I myself put them on timers, because my kids never remember to shut off lights and such.

Re: Bath Fan Switch [Re: George Little] #209038 03/04/13 11:27 AM
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mbhydro Offline
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Timers are better than switches because you want the fan to run after the shower / bath to allow all the humidity to exhaust out. If its on a light switch you only get ventilation while you are in there.

Somewhere I read or was told it should be running for 30 minutes after you get out to bring the humidity back to normal.

Re: Bath Fan Switch [Re: George Little] #209047 03/04/13 07:48 PM
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George Little Offline OP
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I agree with all of the responses. Switch is not required per code but common sense should prevail and it becomes a design issue.


George Little
Re: Bath Fan Switch [Re: George Little] #209050 03/04/13 09:04 PM
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shortcircuit Offline
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I agree the switch is not required by the NEC. The exhaust fan also is not required by the NEC.

Some of the instructions with exhaust fans mention a wall switch in the installation instructions. So 110.3(B) may apply.

Also building codes and building energy codes may mandate an accessible wall controll for occupants.

New this year in Massachusetts, all venting has to be done by a HVAC installer and permits filed with inspections by the mechanical inspector.

This is fine by me...I never looked forward to drilling 4inch holes with a holesaw up on a 24ft extension ladder.


Re: Bath Fan Switch [Re: George Little] #209054 03/04/13 10:18 PM
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gfretwell Online Content
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You find the fan requirement in the building code if your bathroom window is too small or doesn't open.

Typically that is 3 sq/ft with half opening.


Greg Fretwell
Re: Bath Fan Switch [Re: George Little] #209076 03/06/13 09:36 AM
Joined: Apr 2002
Posts: 7,233
HotLine1 Offline
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Fan operation 'may' be addressed within the Energy Codes. I'll ask one of the Building guys today. I have not seen any without a switch, timer, or motion.

Most of the new comm are using motions (with override) in the restrooms.


John
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