How To Wire A Roof Vent Fan

To save time use an existing roof or gable vent to install your new attic fan.

How to wire a roof vent fan.

The adaptor has recesses and a slight curve to hug the shape of your van. Center the fan over the vent before you nail the plywood to the studs. From up on the roof use a jigsaw or reciprocating saw to cut a 4 in. A roof adaptor is a square of plastic designed to level off the vent fan surface.

To install a roof adaptor cut and clean the hole in the roof as you would normally. Before you start step 6 and step 7 make sure to turn off power at your circuit breaker box before you begin any wiring. Wrap the joints with duct tape. Leave the drill bit sticking through the roof so you can find the hole.

When you position the plywood and fan over the vent the back of the fan should be facing you and the front of the fan should be facing toward the vent. You also want a fan that s appropriate for the square footage of your attic space by checking the manufacturer s specifications. Adding a vent fan roof adaptor. Connect and wire the fan slide clamps over the flexible duct at both the roof cap and the fan housing then slip the clamps over the tailpieces of the roof vent and fan and tighten the clamps.

Use wire nuts to connect. 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. There are only two wires on the fan tastic vent roof vent w 12v fan part fv801208 a white wire which is the ground and then a black wire which is the power. Once the fan is centered nail the plywood into the studs to secure the fan over the vent.

The ground wire will need to be ran to a bare metal surface and the power wire will need to be ran directly to the battery it does not go to a thermostat as the controls for the unit are on the bottom. As a bonus it can also help guide the layout process. Rafter vents or insulation baffles install in any rafter space to create narrow gaps that direct fresh air from the soffit vents to the peak of the roof. Start in the attic and drill a hole through the roof in the desired vent location.

Strip away about 6 inches of outer insulation and 1 2 inch of individual insulation from the end of each wire. This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. Try to keep it close to the fan location.