Build Your Own Attic Fan

How to make an inexpensive whole house attic fan using an old box fan and a piece of plywood.

Build your own attic fan.

Thank you for watching. Build the vent box first to the measurements you noted. I picked up a shop type fan and installed it in a 3 4 inch piece of plywood cut to fit the attic door. Quick and easy quick and easy.

Use this information at your own risk. Without an attic fan your attic can get up to 150ºf during the summer which can ruin the integrity of your home and cause high electric bills. Drawing it here to scale will allow for determining accurate lengths and angles and to help you position the pieces together for fastening. Now use your utility knife to cut the fiberglass sheet to size matching the measurements that you have just taken.

You can be creative and make your own fixtures if you want. Cut the louver pieces to the desired size and affix them at the correct angle and spacing inside the vent box. In case you re not familiar this fan is mounted on the ceiling joists in the attic after a hole has been cut out of the ceiling drywall. Attach the face trim with a combination of waterproof glue and galvanized staples placed at the corners and at six inch intervals down each side.

Lay out the shape and size of your vent on a flat work table or sheet of plywood. If you live. There are different materials you can choose from when building your fan cover including plywood and metal however fiberglass is one of the best materials to use when creating a cover for your whole house fan. An aluminum grate is then installed on the ceiling side.

Mount your fan over any existing attic vent hole using the plumbers tape as you see here. It was a simple project and saved a lot of money. The grate has louvers that open and close. What s a whole house attic fan.

I would recommend some kind of insulation around the metal bands like insulation board or dynamatt. The metal bands will humm from the fan. Now use your utility knife to cut the fiberglass sheet to size matching the measurements that you have just taken. Please share and like our page.

5 rip the louver boards on a bevel. I think i spent around 30 for the fan and used a piece of scrap plywood. There are different materials you can choose from when building your fan cover including plywood and metal however fiberglass is one of the best materials to use when creating a cover for your whole house fan. 22 5 degrees is generally enough but 30 or even 45 degrees may be preferred.