How To Vent Bathroom Exhaust Fan In Attic

The manufacturer will give guidance on the total duct length permitted.

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. 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. 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. You should never exhaust the bathroom fan directly into the attic.

Take a look at the installation manual for your fan brand and model. Measure the vent fan. Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the 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. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. Duct already wrapped in insulation at home centers. No you cannot vent your bathroom exhaust fan into the attic.

Through the roof or an exterior gable wall. Either way the vent will have to go directly to the outside and installed with a vent hood cover. You can find 4 in.