Bathroom Vents In Attic
If you vent the bathroom exhaust fan to close to the soffit vents which are vented plates under your homes outer edge and roof your home the air can be sucked right back into the attic from the soffit.
Bathroom vents in attic. We explain how to install bathroom exhaust fans or vents the vent ducting the vent termination at the wall soffit or roof vent fan wiring bath vent duct insulation bath vent lengths clearances routing and we answer just about any other bathroom ventilation design or installation question you may have. Take the time and vent properly but also evaluate the roof s ventilation. The company also extended the bathroom vent down and out a soffit. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.
A 3 or 4 inch duct connects to the outlet on the fan housing and runs to a side wall or to the roof and connects to a vent cap that allows the exhaust to disperse outdoors. It cannot move air to a crawlspace or attic. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. The 2 pipes one a 4 master and the other a 3 2nd do not go through the ceiling but into a common box that goes through the roof.
Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. On my home inspections it is still a common sight for me to see bathroom vents going directly into the attic spewing moisture. The 2nd bathroom vent drips on the floor and is ruining the ceiling. Fans and vents may be installed on the roof system that will draw the air out of the attic space and exhaust it to the exterior.
No you cannot vent the bathroom exhaust fan into the soffit vents. Even if you have moist air entering the attic if the roof is venting properly there s a far lesser risk of mold which prefers stagnant air. Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. Vent your bath and kitchen exhaust fans through the roof through a special roof hood.
This section notes that air exhausted from the bathroom must be sent outdoors not indoors to the same residence or indoors to any other dwelling unit. Can you vent a bathroom exhaust fan into the soffit vents. Whole house fans powered attic fans. The master bathroom and the 2nd bathroom vent through the roof and through the same opening.
The bathroom exhaust ventilation fan disperses air through an opening in the fan housing which is usually 3 inches in diameter and ideally faces in the direction of the ventilation system outlet.