How To Vent Bathroom Exhaust Fan In Attic

Drill a reference hole draw a mark on the bathroom ceiling where you d like to install the vent fan.

How to vent bathroom exhaust fan in attic.

Options for venting a bathroom exhaust fan include best to worst. Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. The manufacturer will give guidance on the total duct length permitted. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.

The correct way to vent a bathroom fan through an attic is to terminate the vent either to the roof or to the gable wall. No you cannot vent your bathroom exhaust fan into the attic. 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. In general you can try venting a bath vent fan down but the combination of down direction elbows and total run length may mean that it s ineffective.

Measure the vent fan. For optimum performance locate it between. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. You should never exhaust the bathroom fan directly into the attic.

Either way the vent will have to go directly to the outside and installed with a vent hood cover. Through the roof or an exterior gable wall. Duct already wrapped in insulation at home centers.