The bathroom here is below an accessible attic so tom ran the exhaust duct across the attic and out a gable end.
Bathroom exhaust fan blowing into attic.
The science of creating the right atmosphere in your attic space did not really become a focus of homebuilders until the last 8 10 years.
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.
Bathroom exhaust fans perform an important function by removing excess moisture from your home.
If you have access to the attic the fan can vent either through a gable wall or roof.
As for the humidity outside being greater that is the reason for installing fresh air ventilation directly into the return side of the ac bringing in clean.
If your attic has been done properly the exhaust from your bathroom is directed through an insulated vent line directly out through a dedicated vent on your roof.
The extractor fan exhaust fan removes humidity and moisture from the bathroom.
Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.
The warm air will exhaust out the duct and enter back into the attic through the soffit vent or ridge vent.
Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out.
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.
The fan sucks in air from the bathroom and blows it out of through a vent that is runs behinds above the ceiling.
Never vent the bathroom into the attic.
Avoid venting through a soffit vent or ridge vent.
The humid air is sucked back in to the attic.
Bathroom vent fans are rated by how many cubic feet of air they can move in one minute known as the cfm rating.
This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.
It is against the residential code and will lead to mold growth in the attic.
To determine which size fan to buy for your bath multiply the room s square footage by 1 1.
Bathroom exhaust fan venting tips and best practices.
Having the fan exhaust into the soffit doesn t help much as the ventilated soffit is the intake for the ventilated attic system.
Letting the fan exhaust into an open attic will cause moisture buildup on the underside of the roof.
Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.
The roof soffit is also an excellent place to vent the bathroom exhaust.
A bird s nest in a bathroom vent will greatly reduce or eliminate the effectiveness of a bathroom exhaust fan.
