Install Attic Ventilation

Measure the distance from the ridge and the edge of the roof to the desired location for your vent.

Transfer these dimensions to the inside of the attic. Measure an equal distance between the rafters at the selected location and mark the point. Drill a nail hole through the roof on the mark.

Cut out the circle template on the box and place it on the roof using the drilled hole as the center.

Trace around the template and cut through the shingles and decking with a jigsaw.

Remove the vent's dome. It makes installation easier.

Center the fan over the hole, making sure the up side of the base flange is pointed toward the ridge under the shingles.

Use caulk or roofing mastic to seal between the roof and fan.

With a utility knife, cut the shingles at the top of the fan to accept the fan's throat.

Set the thermostat at 90ºF degrees. The power ventilator will automatically start at approximately 102ºF degrees. When the temperature drops to 90ºF degrees, the fan will automatically shut off. You can test this with a work light or hair dryer.

Measure the dimensions of the existing louvers from inside the attic.

Cut a piece of plywood the right size to seal off this area. You want to block all airflow except for the vent you'll be installing.

Place the fan on the board in the center and trace around it.

Cut out the area for the fan using a jigsaw or coping saw.

Attach the fan over the hole on the board, and secure the brackets with screws.

Mount this entire assembly over the existing louvers.

Attach the thermostat close to the airflow drawn by the fan or let it hang free.

Set the thermostat at 90ºF degrees. The power ventilator will automatically start at approximately 102ºF degrees. When the temperature drops to 90ºF degrees, the fan will automatically shut off. You can test this with a work light or hair dryer.

Remove a knockout and install a cable clamp in the hole. Thread the power supply cable through this clamp and tighten.

Attach fan wires to the regulator wires according to the manufacturer's instructions.

After making all the connections, install the cover on the regulator, and set the temperature control according to the manufacturer's recommendations.