No you cannot vent your bathroom exhaust fan into the attic.
Bathroom fan venting in attic.
In order to accomplish this the roof has to have a hole cut in it.
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.
This involves running ductwork from the fan usually though an attic and out through the roof.
See bathroom vent duct termination for details about how to terminate the bath exhaust vent duct.
If you vent through a soffit where attic vents are often located the moisture will get sucked back up into the attic or roof venting.
You should never exhaust the bathroom fan directly into the attic.
Example model ventilation codes.
Exhausting of the bath vent fan must indeed be to the building exterior.
This is much easier to do if you have attic access because if you don t you usually have to remove some ceiling drywall and run the ducts along a joist.
It seems like such an easy solution just leave a bathroom vent hose in an attic.
Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.
The building code requires a bathroom exhaust fan to vent outside the building so installation of a new bathroom fan necessarily involves installation of ductwork.
It can be an ugly sight to crawl above a poorly ventilated bathroom s ceiling.
Improperly ending a bathroom vent inside an attic can lead to unintended consequences and builders have stopped this bad practice many years ago.
That is openings doors windows and louvers to the outside should create a.
Venting fans pull moisture laden air out of that small space slowing or altogether preventing it from condensing on walls on the ceiling or worst of all in the ceiling.
If your attic is enclosed california s building code states it should have cross ventilation.
No you should not vent a bathroom fan directly into an attic.
Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.
Through the roof or an exterior gable wall.
However you can vent a bathroom fan through an attic while it terminates on the roof or gable end.
Let me tell you.
Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building.
Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.
Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.
Options for venting a bathroom exhaust fan include best to worst.
