How To Vent Bathroom Exhaust Fan In Attic

Take a look at the installation manual for your fan brand and model.

How to vent bathroom exhaust fan in attic.

Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. 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. 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.

Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. For optimum performance locate it between. Duct already wrapped in insulation at home centers. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.

Through the roof or an exterior gable wall. Drill a reference hole draw a mark on the bathroom ceiling where you d like to install the vent fan. Measure the vent fan. The manufacturer will give guidance on the total duct length permitted.

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. Either way the vent will have to go directly to the outside and installed with a vent hood cover. You can find 4 in.