From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.
Install bathroom fan roof.
Take your power drill and use an extra long 3 4 inch 1 9 cm spade bit to drill a reference hole in the ceiling where you intend to place the fan.
From inside the attic drive a nail through the roof directly above the bathroom vent fan.
For a fan and light switch with existing wiring splice the white wires and connect the grounds securely with wire.
Head up to the attic find the reference hole and clear away the insulation surrounding it.
Drill a reference hole and mark the ceiling.
Connect power to both switches through two pigtails spliced to the feed wire.
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.
From the roof find the nail and use the utility knife to cut roof shingles from around the nail.
Mark the ceiling back in the bathroom measure the inside dimensions of the vent fan s intake port to determine what size hole you need.
Connect the red wire to one switch terminal and the black wire to the other terminal.
You will need a partner for this step as you cannot see the ceiling from this position.
Try to keep it close to the fan location.
Options for venting a bathroom exhaust fan include best to worst.
Leave the drill bit sticking through the roof so you can find the hole.
Center the nail between two rafters.
Use the reference hole as a landmark to transfer your measurements from the attic to the ceiling.
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.
Start in the attic and drill a hole through the roof in the desired vent location.
Bathroom exhaust fans perform an important function by removing excess moisture from your home.
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Measure the vent fan housing.