Install Bathroom Exhaust Fan Roof

This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo.

Install bathroom exhaust fan roof.

A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan. 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. This system is quiet too. Leave the drill bit sticking through the roof so you can find the hole.

Climb into the attic and clear away any insulation from around the hole. Draw a mark on the bathroom ceiling where you d like to install the vent fan. Make sure to check my other vide. Use the information below to select a fan.

You will need a partner for this step as you cannot see the ceiling from this position. From up on the roof use a jigsaw or reciprocating saw to cut a 4 in. The next best location for a bath fan cap is a wall that s at least three to five feet from a roof overhang. Secure the vent flanges with roofing nails before installing the shingles.

You can use the existing switch wires and ductwork. A single exhaust exits through the roof figure a. Most roof overhangs today have continuous soffit ventilation strips. Try to keep it close to the fan location.

Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic. For optimum performance locate it between the shower and the toilet. Start in the attic and drill a hole through the roof in the desired vent location. Access the attic and bring your light cordless drill screws and bathroom fan housing.

Place the fan in the cut out hole so that the bottom edge of the fan is flush with the bottom of the ceiling drywall. The installation is easiest if you re replacing an existing fan. Sinnisjinsulator video includes how to and tips on attic bathroom fans and proper placement and insulation of exhaust hose. Apply roofing adhesive on the underside of the flanges to seal.