Take your saw and make the hole where the fan will go.
How to build a box for attic fan vent.
Step 1 prepare the attic.
Gable roofs are those that consist of two straight sloping surfaces meeting at the apex of the roof.
Set the table saw fence on 5 inches.
Gable roofs and fans.
To save time use an existing roof or gable vent to install your new attic fan.
This way you don t have to cut a brand new hole but simply make the hole for the vent larger so it can accommodate the fan.
Turn the wheel on the table saw that adjusts the angle on the blade until you get a 45 degree angle.
Slit 3 inches in on.
Make sure it is only just large enough to fit the vent.
If you attic is just a crawl space however your options are limited to vents and fans.
Put some glue on the ends of the remaining 22 1 2 inch pieces and secure them between the 28 3 4 inch pieces with box nails.
Make sure that the electricity to the attic is turned off.
Turn the fan over.
Things you will need.
Cut off the end of the power cord using the blade of a utility knife.
Examples include ridge vents box and dome vents soffit vents and gable vents.
How to use a box fan in the attic.
You also want a fan that s appropriate for the square footage of your attic space by checking the manufacturer s specifications.