Bathroom exhaust fans move warm, humid air from the bathroom to outside a building via a duct. As this warm, humid air leaves, it allows cooler, drier air into the bathroom from other areas of the building. Without proper bathroom ventilation, the warm, humid air causes condensation on the interior surfaces of the bathroom. The condensation leads to mold and mildew buildup and possible rotting of wood surfaces. Select a spot on the outside of the building for the flexible duct to exit. The location should be between two studs and no more than 6 feet from the exhaust fan.
Instructions
1. Cut a hole in the side of the building using a 4-inch hole saw. You may need an extension ladder to safely reach the location.
2. Fasten the stub that comes with the hood to the hood with foil duct tape and slide the duct stub on the vent hood through the hole from the outside of the building.
3. Cut a foam gasket to fill any spaces between the wall cap and the siding.
4. Apply a bead of silicone caulk to the siding and gasket and push the vent hood tight to the siding.
5. Screw the vent hood to the siding with 1 1/2-inch stainless screws.
6. Measure the distance between the fan and the vent hood stub and cut a piece of aluminum flex ducting with your aviation snips at that measurement.
7. Attach the aluminum flex ducting to the stub of the vent hood and to the exhaust fan with foil duct tape. Your exhaust fan should now be properly vented to the outside.
Tags: vent hood, outside building, warm humid, aluminum flex, aluminum flex ducting