Yet another bathroom exhaust fan venting question

JulesB

That's scary, at best. Seems like just about anything that can go wrong, did.
If I'm reading correctly, they suggest running metal flashing even on the sides of the window trim? Not something generally practiced in this neck of the woods. Or the four different installers I interviewed to stucco the home I live in now all did/do it wrong.

Thanks again for the informative links.
Regards,
Jules

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handy andy

Don't even think of a ventless bathroom fan. The purpose of a bathroom fan is to exhaust moisture laden air. You will simply have to find a way to run your vent pipe between floor joists or box it in if it can not run between joists.

rightit

Here in the south, we condition the fresh air before it enters the living space via the return air for the air conditioning (outside air is ducted to the R/A). Given that KC can be pretty humid, I would imagine that it's the same there.

You'll want to talk to your HVAC contractor about that. Adding fresh air to the A/C system does eat up a bit of tonnage, and it should also be filtered so as not to create a dirty evaporator coil.

Also down here, it is generally the HVAC contractor that handles the bthrm ventilation, so, unless it's something you want to handle yourself, that's another subject you could ask him about.

Mark

Chris4mx

You could put a larger roof vent in, like a 6" and hook all your fans into it. But you would have to remove the damper from the 6" roof vent and install 4" backdraft dampers on each bath fan. You can get good backdraft dampers at any good Hvac supply house.

JulesB

You'd just have to see the arrangement. Simply no (non-expensive) way to run it.

Issues:
- floor joists run perp to the wall in the pic (perfect if not for windows)
- 7' - 9" ceiling height on the first floor
- Frig and cabnitry to one side
- LVL and steps to other side and end
- 2x4 wall construction
- bedroom directly above
- etc....

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JulesB

I finally found a DIY-friendly HVACer who will be helping me design my radiant floor heat as well as the A/C layout. I know nothing (yet) about air exchangers, so I plan to use him for that as well.

Thanks for chiming in.
Regards,
Jules

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JulesB

The only roof penetration I have is a plumbing vent. I know the best route is to run through the roof on the second story exhaust vents, but I don't want another roof hole, and I need the unobstructed roof space for possible solar at a later date.

thanks.
Jules

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rightit

Generally you place these vent terminations on the back roof of the house. Not sure which slope you'll be placing your possible solar panels on (presumably the slope that receives the most sun), but a vent cap like this might be acceptable to you and should be pretty discreet. It's profile is less than 5":

http://www.grainger.com/Grainger/BRO...905?Pid=search

Mark

JulesB

It's a viable option. I'm wondering if there's any code issues with the height, and snow? And/or an issue with using it on a shallow roof pitch? (3.75/12)

Thanks for the link!
Jules

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