Duct Exhaust Fan In Attic

One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms.

Duct exhaust fan in attic. The duct runs in my attic above the bathroom ceiling two story home. Master flow egv5 gable mount attic ventilators are master flow egv5 gable mount attic ventilators are a great choice for exhaust ventilation. I ve heard that the duct should be insulated to prevent water backflow from condensation during the colder months as my attic is not environmentally controlled. Do not simply terminate a bath vent fan duct in an attic as shown in our photo above nor can you just dump the exhaust vent into a crawl space nor into a closed wall floor or ceiling cavity.

When venting a bathroom exhaust fan make sure to vent the air to the outside rather than into your attic where it can cause mold and mildew to form. I m planning on installing a bathroom exhaust fan just a note the port is 4 and am curious as to what kind of duct should be used. They are typically easier to install and won t detract from the appearance of your roof. I used flexible 4 aluminum duct to the exhaust damper on the roof.

The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. In un conditioned space such as an attic where otherwise your fan duct will be exposed to cold attic air in winter use insulated solid metal ducting or insulated flex duct. Learn the secrets to running anew exhaust line through the outside wall install a fan and connect the ducting and electrical.

Bathroom exhaust fans perform an important function by removing excess moisture from your home. I recently installed a bathroom exhaust fan. They can quickly remove a larger volume of hot and or humid air from your attic compared to static ventilation which helps save money on your heating and cooling. A 3 or 4 inch duct connects to the outlet on the fan housing and runs to a side wall or to the roof and connects to a vent cap that allows the exhaust to disperse outdoors.

Otherwise you re inviting a moisture mold rot insect problem in the building. This is non usable space and it is well ventilated with ridge and soffit ventilation so it does get cold in the winter. You can find 4 in. The exhaust vent must terminate outdoors.

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