No you should not vent a bathroom fan directly into an attic.
In attic bathroom vent fan.
Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.
Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.
Ceiling fans vent either into the attic or outside through the roof.
Let me tell you.
No you cannot vent your bathroom exhaust fan into the attic.
You should never exhaust the bathroom fan directly into the attic.
All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans.
Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.
One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms.
It s all outdoor air anyways right.
Surprisingly bathroom fans are not required by some building codes.
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.
However you can vent a bathroom fan through an attic while it terminates on the roof or gable end.
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.
To avoid mistakes not running it at all consider installing switches with built in timers.
Wall mount fans are mounted on an external wall of a home and are used if there isn t a way to vent through the roof as in the case of a bathroom on the first floor of a home.
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.
It seems like such an easy solution just leave a bathroom vent hose in an attic.
Before you rush to the attic or go the roof to check for any leaks make sure the exhaust fan duct is properly insulated and run the fan more frequently for a prolonged period.
While insulating you can make some mistakes.
Bathroom code does address the issue of moving odor and moisture laden air from the bathroom to the outside.
If you vent through the roof condensation will drip back into the interior.
Each fan vents separately out the roof.
Through the roof or an exterior gable wall.
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.
Improperly ending a bathroom vent inside an attic can lead to unintended consequences and builders have stopped this bad practice many years ago.
I recommend that my clients vent their bath fans out a gable wall if at all possible when not using an hrv or erv that is.
