Vent Bathroom Fan Out Roof

I have gotten mixed opinions on whether to vent the new fan through the roof or through the soffit eave.

Vent bathroom fan out roof.

From inside the attic drive a nail through the roof directly above the bathroom vent fan. How to repair a bathroom fan. This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover.

Installing a vent hood on the roof. If you have two bathrooms that are close together and one has an exhaust fan and the other doesn t you might be. As a rule of thumb most bathroom air movement capacity rates will work out to be one cfm per square foot of bathroom area. This involves running ductwork from the fan usually though an attic and out through the roof.

Bathroom exhaust fans perform an important function by removing excess moisture from your home. 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. Slide a flat pry bar underneath the shingles around the nail to break the weather seal. No you cannot vent your bathroom exhaust fan into the attic.

Center the nail between two rafters. Each fan vents separately out the roof. It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. A down through soffit exhaust vent design by leaving warm air in the exhaust duct when the fan is off creates a heat trap that reduces heat loss out of the bathroom through the exhaust fan duct when the fan is off in comparison with up routed vents or even horizontal vents through a gable end wall. The roof contractor recommends the soffit to minimize protrusio. Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out.

For example an 8 x 5 bathroom would require a 40 cfm exhaust fan. I am getting a new roof installed and tear off and likely a lot of plywood and am simultaneously getting a new bath vent fan.