How To Wire A Roof Vent Fan

Insert the end of the 12 2 wire into the fans junction box.

How to wire a roof vent 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. Wrap the joints with duct tape. 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.

This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. You also want a fan that s appropriate for the square footage of your attic space by checking the manufacturer s specifications. From up on the roof use a jigsaw or reciprocating saw to cut a 4 in. As a bonus it can also help guide the layout process.

Start in the attic and drill a hole through the roof in the desired vent location. 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. These specialty vents do not affect the. To install a roof adaptor cut and clean the hole in the roof as you would normally.

See below for a shopping list and tools subscribe. The adaptor has recesses and a slight curve to hug the shape of your van. A roof adaptor is a square of plastic designed to level off the vent fan surface. Use wire nuts to connect.

Leave the drill bit sticking through the roof so you can find the hole. Once the fan is centered nail the plywood into the studs to secure the fan over the vent. Strip away about 6 inches of outer insulation and 1 2 inch of individual insulation from the end of each wire. 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.

Adding a vent fan roof adaptor. Before you start step 6 and step 7 make sure to turn off power at your circuit breaker box before you begin any wiring. Try to keep it close to the fan location.