How To Wire A Roof Vent Fan

Adding a vent fan roof adaptor.

How to wire a roof vent fan.

Leave the drill bit sticking through the roof so you can find the hole. To install a roof adaptor cut and clean the hole in the roof as you would normally. A roof adaptor is a square of plastic designed to level off the vent fan surface. Insert the end of the 12 2 wire into the fans junction box.

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. You also want a fan that s appropriate for the square footage of your attic space by checking the manufacturer s specifications. Wrap the joints with duct tape. Use wire nuts to connect.

Before you start step 6 and step 7 make sure to turn off power at your circuit breaker box before you begin any wiring. Start in the attic and drill a hole through the roof in the desired vent location. 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. 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.

This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. Strip away about 6 inches of outer insulation and 1 2 inch of individual insulation from the end of each wire. To save time use an existing roof or gable vent to install your new attic fan. Once the fan is centered nail the plywood into the studs to secure the fan over the vent.

Center the fan over the vent before you nail the plywood to the studs. 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. From up on the roof use a jigsaw or reciprocating saw to cut a 4 in. See below for a shopping list and tools subscribe.

The adaptor has recesses and a slight curve to hug the shape of your van. 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. 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.