In this video this old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.
Install a roof vent for exhagust fan.
Exhaust fans mounted on an exterior wall vent directly outside without any ductwork required.
The lower half of the flange sits on top of the shingles.
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Installing an exhaust fan requires electrical connections and ventilation to the exterior of your home.
Apply a bead of asphalt roof cement on the bottom of the vent.
Choosing a whole house fan.
Center the nail between two rafters.
Slide the vent under the shingles so they cover the top half of the vent flange.
Nail the lower corners with roofing nails and tar the heads.
Then use a screw to secure the duct connector to the edge of the hole so that it will line up with the exhaust on the fan housing.
Ceiling mounted fans typically use ducts hidden in the walls ceiling or attic to reach a safe exit point on the roof or a wall.
Be sure to install the duct in the position specified by the instructions so the housing will line up correctly.