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Where to vent bath fan

2151 Views 8 Replies 4 Participants Last post by  AllanJ
Adding a 2nd fan to bath inside the shower.stand up shower all enclosed.. the toilet is in a seperate room with a fan. My home inspector advised adding a fan inside the shower.......... i can vent a few ways not sure which one is the best way..I can go straight up about 3' and do a roof vent, or cut a hole in the plywood to access open area where the porch is which is covered by the roof as well... i would add a vent in vinyl facing downwards to porch
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The roof mount exhaust is 5-10% more efficient at removing warm, moist air (hot air rises) than a side mount one. Roof terminal should have a pipe neck attached for a positive connection. Use straight pipe (metal or PVC) whenever possible, wrapped with insulation. Corrugated, flex, pipe creates turbulence and has almost double the surface area for water exhausted in baths to collect on. Use as few bends as possible, and 45s* instead of 90s*. Tape metal joints with silver tape, not duct tape (4 year life). Use hose clamps or similar, and a screw on topside of metal joints. Use HVAC black tape for plastic covered insulation. Insulate the whole pipe and the fan box. Use caulk to seal the small gaps at the fan to wallboard joint. Let no heated moist air into the attic which would cause mold, mildew, wet other insulation (defeating its purpose), and even make frost in your attic. Be safe GBAR
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