An exhaust vent fan can exhaust out through a gable end side wall or out through a soffit overhang.
Bathroom duct to attic gable vent.
First off you ll be reducing the size of the gable vent.
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.
Bathroom exhaust fans perform an important function by removing excess moisture from your home.
The best way to vent bathroom fans is with schedule 20 bell end drain pipe.
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.
The resistance to the airflow in the long duct caused the air to back up in the nearest bathroom especially when more than one fan was on at the same time.
And of course a bathroom with a window doesn t require an exhaust vent.
Whatever area you block with the exhaust duct is a reduction in the area of the gable vent.
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.
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.
Crawling in the attic revealed the connection of four bath fans into one long duct going to a gable vent.