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Can I connect two bathroom fan ducts to a single roof vent?

I have a bathroom vent. I just installed another similar vent in my closet and when I was in the attic I noticed the ducts from both are quite close next to each other. Both of them use 4" ducts and I'd rather not cut another hole in the roof. I know 100% that the new vent has a flap to prevent air back flow. I have not checked the bathroom vent but it's only couple of years old and I assume it has the same. I was wondering if it is possible to connect both ducts to the same vent in the roof, perhaps by using some y-connector. Are there any cons or pros? Is it in compliance with whatever codes that govern ventilation?

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  • Broan-NuTone Master
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No, both cannot be connected to same vent.
Or vent exhause from 1 fan will vent into other bathroom.
All house vents require separate duct.

Posted on Nov 27, 2014

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Posted on Jan 02, 2017

SRF518
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SOURCE: When we built our new 2-story home the contractor

get a weighted damper and install over the existing vent. the weight will open when the exhaust fan is running and stay shut via the weighted arm.

Posted on Oct 23, 2009

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Every winter water drips from my bathroom ceiling mounted extractor fan, worse when there is bad condensation. The vent goes straight up and up through the loft space and out of the roof, there appears to...


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