Bath fans are essential to a properly functioning home. Fans capture excessive moisture and exhaust it to the outside. This helps prevent condensation and mold that can damage the home’s structure. How should bathroom fans be ducted? All bathroom fans should duct to the outside. Illustration V019 shows correct ducting through the attic and the roof. The duct runs are smooth and short, with limited bends. A large diameter (4- to 6-inch) duct allows better flow. The roof vent connector has a damper, and the duct is insulated to prevent condensation. ...
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