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.
2007-03-06 11:52:30 · 11 answers · asked by bleads 2 in Home & Garden ➔ Maintenance & Repairs
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".
2007-03-06 12:01:26 · answer #1 · answered by gipsygman 2 · 1⤊ 0⤋
Bathroom Exhaust Vent Pipe
2016-11-11 06:23:26 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Come on people, think about this. T'ing into an existing line has the potential to create a vacuum...which means that you lose efficiency where they merge. They have anti-reversion flaps on most fans nowadays, but that doesn't help if you are pushing air out further forward. Additionally, fan vent lines are sized to the fans hooked to them, that is why it matches the outlet on the fan box. What now happens if you run both fans at the same time? Yep, you can't evacuate the same amount of air. Bathroom fans are NOT efficient at moving air. Even with higher CFM ratings, they are moving air over a substantial distance, and through often restrictive tubing. There is a reason it's not done like this. Don't cut corners. If you are going to cut corners, you might as well just vent it into your attic. I've seen people do that and not have problems for decades. It's just as wrong as t-ing two vents together, so whats the real difference?
2016-03-18 04:05:21 · answer #3 · answered by Anonymous · 0⤊ 1⤋
Bathroom Roof Vents
2017-01-01 07:01:50 · answer #4 · answered by ? 4 · 0⤊ 0⤋
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.
2007-03-06 12:44:16 · answer #5 · answered by dgc1973ent 1 · 0⤊ 0⤋
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.
2007-03-06 12:29:49 · answer #6 · answered by ardy 2 · 0⤊ 0⤋
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.
2007-03-06 12:02:03 · answer #7 · answered by Win S 4 · 0⤊ 0⤋
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.
2007-03-06 12:05:55 · answer #8 · answered by Cotton 3 · 0⤊ 0⤋
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.
2007-03-06 11:57:53 · answer #9 · answered by cajunrescuemedic 6 · 2⤊ 0⤋
yes you can. use a y or t fitting.
2007-03-06 12:18:32 · answer #10 · answered by Anonymous · 0⤊ 0⤋