What problems can I anticipate, precautions should I take, venting a bathroom fan through the roof in a cold climate. Winter temperatures reach -40. Snow will build up on the roof. Going through a gable end wall would involve a much greater distance. I don’t think roof vents are uncommon here.
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make the vent higher than the snow?
a
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The warm exhaust might melt it's own channel through the snow. Be sure to insulate the duct or use insulated flexible pipe in the attic to prevent condensation. Keeping the run as short as possible is a good idea.
Al Mollitor, Sharon MA
Distance isn't a problem as loing as it's not over about twenty feet or so. Rather than worry about insulated pipe which I doubt would do much good, make sure that it loops up and back low to have a cold catch. Cold air settles low and so would moisture from condensation so that drip loop would prevent both from leaking back into the room it exited.
Panasonic and Fantech make great efficient and quiet units. The blower motor is separated fromn teh room by several feet and you can run more than one room on the same fan. The separation keeps the noise in the attic instead of over your head.
Most times, the heat exhausted will melt the snow away so don't be concerned about that.
Don't exit near a soffit vent or gable end vent or the moisture could be drawn right back into the attic again.
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