I have 2 bathrooms on our 2nd floor that exhaust directly into the attic. The idiots that installed them did not vent them to the outside. I have asked a roofer to install flashing for one 3″ vent pipe. Can I run both exhaust fans to this vent or will it just exhaust into the other bathroom? I was thinking of whying the 2 ducts to the roof vent.
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yeah, you shouldn’t have any problems with that, especially if you use the “Y”. I would do that myself. You want as less holes in your roof as possible (any hole-potential leak)….so one roof vent should be fine.
I don’t know why not.
If you attatch the vents to a “Y” shaped duct. The “Y” will be upside-down with the roof vent at the top. There should already be a flapper on each fan unit that doesn’t allow “back draft”.
Each exhaust fan shoid have a flapper check valve on it to prevent air coming back down to the bathroom. Call your local building inspector to ask if the two can be piped together, although it shouldn’t be a problem. Make sure your vent pipe meets local code for heigth and diameter.
Yes, you can. But, ensure that each fan has a “Flapper” valve attached to each unit, to prevent the back flow you mentioned.
You are correct in “whying” them together. It is both legal and done everyday by plumbers.
yes you can. use a y or t fitting.
The bathroom vent fan should have a door that opens when the fan is on, and closes when the fan is off. This door should keep the exhaust from another fan from coming back into the house.
There might be a local code issue that would keep you from being able to join the two together, but I doubt it. You can check with your local cod enforcement dept. at City Hall, or just wing it.
3″ is 75mm ,,, which tells me that you have reduced the cowling on the exhaust fan, and if you have then you will have no problem splicing them together or use a ‘Y’ joiner. Just remember to not have the 2 pipes at 90* and the flow of moving air is moving towards the outside duct and then thier should not be any flow back into other room….. remember to connect the reduced sizes and not the larger size. good luck ///// I personally would get air conditioning ducting and use a single vent to exit the roof.