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Horace 07-26-2006 07:35 PM

Bathroom exhaust question
 
Does it make sense to exhaust a bathroom exhaust fan through the attic and to the vent in the gable? It would seem to me that overtime the moisture would eventually rot the wood, or cause mold. That plus the run from the floor of the attic to the vent is about 4 feet up.

MinConst 07-26-2006 09:22 PM

As long as you don't lesson the air flow of the gable vent and restrict it's intended use I don't see a problem. Getting the moisture out of the building is the key. Unless the outside is dead air space the moisture should evaporate fine.

manhattan42 07-26-2006 11:28 PM

Quote:

Originally Posted by Horace
Does it make sense to exhaust a bathroom exhaust fan through the attic and to the vent in the gable? It would seem to me that overtime the moisture would eventually rot the wood, or cause mold. That plus the run from the floor of the attic to the vent is about 4 feet up.

Building Codes generally require bathroom exhaust fans to vent directly to open space(air) and never to an attic.

This generally means you cannot vent a bath exhaust into an attic and expect it to passively vent via attic vents.

Under most circumstances, MinConst is wrong and in violation of most building codes....

Bonus 07-27-2006 12:26 AM

It's not hard to take it through the roof, then you don't have to worry about condensation up there.

J187 07-27-2006 07:54 AM

Quote:

Originally Posted by manhattan42
Building Codes generally require bathroom exhaust fans to vent directly to open space(air) and never to an attic.

This generally means you cannot vent a bath exhaust into an attic and expect it to passively vent via attic vents.

Under most circumstances, MinConst is wrong and in violation of most building codes....

I think we are all on different pages here as far as how we interpret the question. I did not think anyone was talking about venting into the attic and hoping for the moisture to pass through gable. I thought the poster was asking if it is ok to run the duct from the floor of the attic over to the gable and put the outlet against it for passage. I believe the instructions on some NewTone fans say you can do this. I still would just go through the roof.


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