Allowing the exhaust to vent into your attic can potentially cause several moisture problems.
Can you exhaust bath fan into attic.
In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover.
Options for venting a bathroom exhaust fan include best to worst.
Bathroom exhaust fans perform an important function by removing excess moisture from your home.
In no case is it acceptable to just dump any exhaust fan directly into an attic.
All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans.
Anon if i understand your original question you have a bath exhaust that is discharging into a roof cavity or space not to outside.
Surprisingly bathroom fans are not required by some building codes.
There aren t many options for routing an exhaust fan to the outside of the house.
All the moisture from your bathroom will be discharged into the garage.
No matter the location of the bathroom you can vent the exhaust fan through the wall.
There are really only three venting options.
Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out.
It needs to exhaust to the exterior.
It seems like such an easy solution just leave a bathroom vent hose in an attic.
If you re simply replacing the fan the ducts should already be set up for you.
You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it.
Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.
No you cannot vent your bathroom exhaust fan into the attic.
After a while all that moisture will condense on this equipment and this is a recipe for disaster.
This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.
The exhaust needs to vent outdoors.
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.
In those areas ventilation in bathrooms is required but it can be from a window or fan your choice.
You should never exhaust the bathroom fan directly into the attic.
However that is what you do when you vent the bathroom exhaust fan into the garage.
Before you can start replacing your old bathroom fan you ll need to determine what the fan size is.
Ductwork is what will connect the fan to the outside.
But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms.
No you should not vent a bathroom fan directly into an attic however you can vent a bathroom fan through an attic while it terminates on the roof or gable end.
