Can I pipe two bathroom fans to one roof vent?


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Old 05-27-07, 08:27 AM
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Can I pipe two bathroom fans to one roof vent?

I have two adjacent bathrooms that I would like to add fans in.

The fans would be located within 5-6 feet of each other and could easily exit the roof at the same point.

If I remember correctly, fans all have a "check valve" or flapper preventing back flow and drafting back into the room.

With that in mind, if they were both plumbed into one vent, it should be no problem right? Turn one fan on, the flap on the other one closes. Turn both on and they both vent.

Good idea or bad? Saves me a little bit of money and one hole in the roof.
 
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Old 05-27-07, 10:22 AM
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You can do it, but you will have to increase the size of the final pipe to 6", since you will be feeding two 3 or 4" ones into it. Find an appropriate "y" fitting and the right size vent to mount on the roof.
 
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Old 05-27-07, 11:34 AM
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While Chandler is correct that it can be done it really shouldn't be done. You will have far better performance by using separate roof jacks.
 
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Old 05-27-07, 06:39 PM
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I agree with furd, in that it can be done but isn't the best solution.
 
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Old 05-27-07, 09:58 PM
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Thanks for the replies. I do believe I'll go with two separate vents.
 
 

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