Vent Fan Through Roof With Damper

Most roof caps for bath fan exhausts have a light aluminum backdraft damper which rests on a sealant strip which is basically a foam piece of weatherstripping.

Vent fan through roof with damper.

Find the vent hood on your roof or exterior wall. Roof vent kit from broan is designed to vent kitchen or bath exhaust fans through a slanted roof. 80 0 20 oz 19 99 19 99. This involves running ductwork from the fan usually though an attic and out through the roof.

Vent your bath and kitchen exhaust fans through the roof through a special roof hood. Do the same thing with a roof cap although it may not need a spring due to its more horizontal orientation. Start with the outside cap. In order to accomplish this the roof has to have a hole cut in it.

Also see if the damper itself is bent or being blocked from closing completely. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. If the damper won t open the fan may drive enough air through the duct to cause condensation but not enough to warm the duct and dry it out. Use rigid metal ducting aluminum or galvanized steel with lengthwise seams facing up and joints sealed with foil tape or duct mastic or rigid plastic pipe.

If you hear the fan running try listening and turn the fan off to see if you hear the damper close when the air flow stops holding it open. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. Comes with a black steel roof cap. I have my fan vented out through the roof but near the inside of the roof in my attic the vent leaks a bit and condensation gets on the wood and a bit down in the insulation around where the vent goes out.

If you can t hear anything it could be the damper is stuck. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. If you vent through a soffit where attic vents are often located the moisture will get sucked back up into the attic or roof venting. Make sure the damper isn t obstructed or stuck.

There s a damper on the fan housing too but the outside damper is much more likely to stick. If the hood s duct has a wall cap it should have a spring holding its damper shut when the fan is off.