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Old 09-10-2012, 09:42 AM   #1
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Two hot switches to same fixture?


I'd like to exhaust two bathroom fans through the same gable vent. A solution I thought of to avoid venting one bathroom into the other is to use an inline duct fan at the gable vent. Ideally, I'd like to have the inline vent come on with each bath fan, that is when the bath fan is switched on, the inline fan also switches on. I'm just not sure how to wire it in such a way that if both bathroom fans are on at the same time, the inline fan does not receive current from two sources simultaneously.

Any suggestions/ideas are greatly appreciated. Thanks a lot in advance!

-Pete

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Old 09-10-2012, 09:51 AM   #2
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Two hot switches to same fixture?


In high rises they often use a single fan to vent many bathrooms. If I am picturing what you have correctly, you could install one fan that has (2) intakes in a place like your attic. You could then vent that fan outside. Then you run a separate hot & switch leg to each bathroom that would turn on the fan from either bathroom.

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Old 09-10-2012, 10:09 AM   #3
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Two hot switches to same fixture?


Check out the Panisonic web site.
They have fans with two inlets and one outlet.
You could control the fan with 3 way switches.
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Old 09-10-2012, 10:18 AM   #4
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Two hot switches to same fixture?


Hi JulieMor - thanks a lot for your reply. Unfortunately, the inline fan idea was an afterthought. I have already installed a ceiling fan in one bathroom and have a ceiling fan to put in the other. I had planned to tie the two exhausts into each other and simply vent out of the gable but I heard that sort of system can allow one bathroom to vent into the other, which makes sense. Then I had the idea of an inline fan that would effectively 'pull' the air through the system and out the vent while the bathroom fans 'push' air through the system. If this sort of thing were to work, I would need to have the inline fan come on with each of the bathroom fans. Otherwise, I would need to have a separate switch for just the inline fan but would prefer not to do it that way.
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Old 09-10-2012, 02:45 PM   #5
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Two hot switches to same fixture?


Both bathroom fans need to be on the same circuit and both will come on along with the inline fan unless you instal complicated contactors in a master control box.
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Old 09-10-2012, 03:36 PM   #6
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Two hot switches to same fixture?


Do you need both exhaust fans and an inline fan? Seems like the inline fan would do the trick.
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Old 09-10-2012, 03:47 PM   #7
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Two hot switches to same fixture?


How common of a set up is this (an inline fan that can vent two bathrooms)?

I ask because this is what i am looking to do in my upcoming bathroom remodel. 1957 home with a fan to the main bath but none to the master right next to it. i plan on adding a shower to the master and connecting the two vents and having a van inline upstream of the intersection.

Will the fans on the market today properly vent a bathroom if they are 5 feet or so upstream?

how does the wiring work? Is this a three way switch wiring were flipping the switch in one bathroom could unknowingly turn off the running fan in the other bathroom?

B
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Old 09-10-2012, 03:52 PM   #8
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Two hot switches to same fixture?


Quote:
Originally Posted by joecaption View Post
Check out the Panisonic web site.
They have fans with two inlets and one outlet.
You could control the fan with 3 way switches.
Don't use 3 ways, you won't know if up or down is 'ON' or 'OFF'
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Old 09-10-2012, 03:53 PM   #9
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Two hot switches to same fixture?


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Don't use 3 ways, you won't know if up or down is 'ON' or 'OFF'
Yes...wire regular single pole switches in parallel.
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Old 09-10-2012, 03:53 PM   #10
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Two hot switches to same fixture?


Quote:
Originally Posted by Beepster View Post
How common of a set up is this (an inline fan that can vent two bathrooms)?

I ask because this is what i am looking to do in my upcoming bathroom remodel. 1957 home with a fan to the main bath but none to the master right next to it. i plan on adding a shower to the master and connecting the two vents and having a van inline upstream of the intersection.

Will the fans on the market today properly vent a bathroom if they are 5 feet or so upstream?

how does the wiring work? Is this a three way switch wiring were flipping the switch in one bathroom could unknowingly turn off the running fan in the other bathroom?

B
Fantech makes this setup easy... and dont use 3-ways, just use single pole switches.
http://residential.fantech.net/resid...h/dual-grille/

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Old 09-11-2012, 08:57 AM   #11
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Two hot switches to same fixture?


Thanks Stick.

If you were doing what i was doing and had easy access above (main floor on rambler, acces panel 10 ft away) would you do the fan like you have in the picture, or would you just add a separate fan and put another hole in the roof?

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Old 09-11-2012, 05:59 PM   #12
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Two hot switches to same fixture?


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Originally Posted by Beepster View Post
Thanks Stick.

If you were doing what i was doing and had easy access above (main floor on rambler, acces panel 10 ft away) would you do the fan like you have in the picture, or would you just add a separate fan and put another hole in the roof?

B
Depends, I wouldn't penetrate the roof if I could help it though, I always shoot for the gable...

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