We explain how to install bathroom exhaust fans or vents the vent ducting.
Bathroom ventilation fan into attic.
Surprisingly bathroom fans are not required by some building codes.
Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.
First you ll partially block your roof vent with the piping reducing the flow of cooling air through your attic.
Either way the vent will have to go directly to the outside and installed with a vent hood cover.
Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out.
You should never exhaust the bathroom fan directly into the attic.
How do i properly vent a bathroom fan into an attic.
How to install a bathroom vent fan.
All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans.
You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it.
No you cannot vent your bathroom exhaust fan into the attic.
This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.
In those areas ventilation in bathrooms is required but it can be from a window or fan your choice.
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.
Note that the bathroom vent fan must always exhaust to the outdoors.
This article series explains why bathroom vent fans are needed and describes good bath vent fan choices necessary fan capacity and good bath vent fan and vent duct installation details.
Options for venting a bathroom exhaust fan include best to worst.
Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.
Never allow the duct to simply blow into an attic crawlspace or other enclosed area.
Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.
This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo.
The vent hood will have a little flap that opens when air is blowing.
Bathroom exhaust fans perform an important function by removing excess moisture from your home.
The correct way to vent a bathroom fan through an attic is to terminate the vent either to the roof or to the gable wall.
But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms.
In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover.
Second during cold winters you ll be blowing warm moist air onto a cold surface the roof vent and roof plywood.
