To install a bathroom fan go into your attic and clear away the insulation where the fan will go then return to the bathroom and use a jigsaw to cut out the hole for the fan.
How to install a bathroom fan in the wall.
For optimum performance locate it between the shower and the toilet.
Lower the fan into place and secure it with drywall screws then use flexible duct pipes to vent the fan to the outside.
Attach wood pieces with screws.
Cut or push back the insulation leaving a 6 inch gap between the unit and insulation.
Attach the bathroom fan to the joist.
Climb into the attic and clear away any insulation from around the hole.
You will need a partner for this step as you cannot see the ceiling from this position.
The next step in your bathroom fan installation is to attach the fan enclosure to the joist with screws.
Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic.
Choose the exact area where the exhaust fan will be installed.
Pick up the fan s housing and using its inner portion trace the edges of it onto the wall with a marker.
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Since a bathroom vent fan should run for 10 15 minutes after you finish your shower to remove all the moisture consider a fan that cuts on and off automatically using a moisture sensor or replace the wall switch with a timer.
Cut pieces of a 2 foot x 4 foot board to fit between the joists blocking off the fan from the insulation.
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.
Learn the secrets to running anew exhaust line through the outside wall install a fan and connect the ducting and electrical.