Install Bathroom Exhaust Fan Roof

A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.

Install bathroom exhaust fan roof.

You mount a switch in each bathroom. Leave the drill bit sticking through the roof so you can find the hole. The next best location for a bath fan cap is a wall that s at least three to five feet from a roof overhang. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo.

You will need a partner for this step as you cannot see the ceiling from this position. Climb into the attic and clear away any insulation from around the hole. Attach the bathroom fan to the joist. Access the attic and bring your light cordless drill screws and bathroom fan housing.

Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. Most roof overhangs today have continuous soffit ventilation strips. Apply roofing adhesive on the underside of the flanges to seal. Start in the attic and drill a hole through the roof in the desired vent location.

Sinnisjinsulator video includes how to and tips on attic bathroom fans and proper placement and insulation of exhaust hose. Try to keep it close to the fan location. For optimum performance locate it between the shower and the toilet. Also it helps to get a fan that s the same size as your existing fan so you won t have to adjust the size of the ceiling hole.

The installation is easiest if you re replacing an existing fan. From up on the roof use a jigsaw or reciprocating saw to cut a 4 in. Use the information below to select a fan. Draw a mark on the bathroom ceiling where you d like to install the vent fan.

You can use the existing switch wires and ductwork. Make sure to check my other vide. Secure the vent flanges with roofing nails before installing the shingles. This system is quiet too.