This involves running ductwork from the fan usually though an attic and out through the roof.
Bath fan vented to attic.
Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out.
Bathroom code does address the issue of moving odor and moisture laden air from the bathroom to the outside.
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.
No you cannot vent the bathroom exhaust fan into the soffit vents.
If you vent through the roof condensation will drip back into the interior.
Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.
This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo.
Surprisingly bathroom fans are not required by some building codes.
All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans.
Options for venting a bathroom exhaust fan include best to worst.
Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.
But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms.
Vent your bath and kitchen exhaust fans through the roof through a special roof hood.
In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover.
A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.
The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.
Can you vent a bathroom exhaust fan into the soffit vents.
I would by lying if i told you that it will cause problems it may be totally fine.
Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.
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.
This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.
The truth about attic bathroom venting.
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.
In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly.
The lowdown on venting your bath fan into an attic is that it can be done but it should terminate on the outside.
Bathroom exhaust fans perform an important function by removing excess moisture from your home.
