Bathroom Ventilation Fan Into Attic

It s all outdoor air anyways right.

Bathroom ventilation fan into attic.

The question about moist air reentering an attic through soffit vents after it has been blown out of an exhaust vent opening is a fair one but i don t think that s likely to be a significant building moisture source. For optimum performance locate it between the shower and the toilet. Through the roof or an exterior gable wall. Draw a mark on the bathroom ceiling where you d like to install the vent fan.

However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. When venting a bathroom exhaust fan make sure to vent the air to the outside rather than into your attic where it can cause mold and mildew to form. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. Our article bathroom ventilation codes specs cites the importance of venting bath vent fans to the outdoors not into an attic or crawl space.

Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. You should never exhaust the bathroom fan directly into the attic. Climb into the attic and clear away any insulation from around the hole. It seems like such an easy solution just leave a bathroom vent hose in an attic.

Options for venting a bathroom exhaust fan include best to worst. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.