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Old 03-28-2013, 07:34 AM   #16
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This light leaks air into attic, should I cover?


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Originally Posted by asinsulation View Post
You CAN vent them together. They make "Y" connections as well as flappers with gaskets specifically for the circumstance. It can be a little time consuming to get it all together, but sometimes easier then making 2 holes depending on the situation.
We always like 2 holes as well.

if the flapper gets stuck...nobody wants to smell their neighboring bathroom's business.

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Old 03-28-2013, 02:52 PM   #17
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This light leaks air into attic, should I cover?


Hey, you are all one family anyway, lol. A duplex/townhouse would not have joined exhaust vents, per fire-separation. Choose one; "A"- https://www.acwholesalers.com/brd101...Fap_QgodajoA_A

or "B"- http://www.ventingdirect.com/contine...stems/p1471567

I'd go with "B"; designed like plumbing waste fittings, not 1/2 of air-flow needs to turn at almost right angle to vent, lol. Use the straight end of connection for the bath farthest away for optimum pressure loss.
Bath fans have self-closing flappers at the motor to prevent incoming air flow. One duct from the "Y" would help reduce condensation in the whole system. Be sure to insulate the ducting, and a plastic wrap to prevent condensation on/in the pipes. Air/moisture goes right through fiberglass insulation= look at your furnace filters. They skipped that part on TOH video, as did the flashing above and under the next lap siding for water drainage not relying on caulking alone- 6-15 year life. So easy to use a metal roof flash while on the ladder... Par for them, about there, but not quite... I smile a lot while watching them.

Gary
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Old 04-04-2013, 12:02 PM   #18
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This light leaks air into attic, should I cover?


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Originally Posted by joecaption View Post
Those are sewer gas vents, unless you want sewer gases and methane gas going into the room I would not suggest it.
And no the two bathrooms can not be tee together with one vent. The air would just blow into the other bathroom not out the vent.
Not quite, because bathroom fans have check valves in them (otherwise, wind gusts would blow through as well), but I inheirited that particular configuration in my house and I can say that it hurts the efficiency of the system.

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