Bathroom Exhaust Fan To Attic

This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.

Bathroom exhaust fan to attic.

For optimum performance locate it between the shower and the toilet. The warm air will exhaust out the duct and enter back into the attic through the soffit vent or ridge vent. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. Through the roof or an exterior gable wall.

In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. Each fan vents separately out the roof. It s also important to note that if you install a roof vent cover for a clothes dryer you must remove the metal screen because it will catch lint and may turn into a fire hazard.

Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out. Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. Draw a mark on the bathroom ceiling where you d like to install the vent fan. No you cannot vent your bathroom exhaust fan into the attic.

You should never exhaust the bathroom fan directly into the attic. Letting the fan exhaust into an open attic will cause moisture buildup on the underside of the roof. If you have access to the attic the fan can vent either through a gable wall or roof. Options for venting a bathroom exhaust fan include best to worst.

Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof. Climb into the attic and clear away any insulation from around the hole. A bird s nest in a bathroom vent will greatly reduce or eliminate the effectiveness of a bathroom exhaust fan.