Bathroom Exhaust Fan Duct Routing

Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. This involves running ductwork from the fan usually though an attic and out through the roof. Routing vertically out of the roof or routing through the upper part of the wall to the exterior are time consuming invasive projects.

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This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.

Bathroom exhaust fan duct routing. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. Be sure to install the duct in the position specified by the instructions so the housing will line up correctly. Up through roof down through floor or crawl area. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems.

The duct should vent to the outside. In addition to insulating the fan duct to reduce the condensation rate on both interior and exterior surfaces insulation should be placed only on the outside of such exhaust ducts use of smooth surfaced solid metal avoids little depressions where condensate can accumulate and leak into the building and sloping the duct properly back towards the bathroom as discussed in the article above will avoid water and ice accumulation at the exhaust duct termination. In all cases the ducting needs to conduct the exhaust to the building exterior and needs to terminate in an animal proof vent cover. Bath vent fan duct routing.

Behind a gable vent. The bath should be vented by either a 20 cfm continuous vent fan or a 50 cfm vent fan that is intermittent or switched. This article weries describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. Options for venting a bathroom exhaust fan include best to worst.

It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. Through the roof or an exterior gable wall. Bath vent fan duct routing questins answers. You can find 4 in.

While this is not smart it is understandable. Attics and crawlspaces are often the shortest possible route for the vent. We also provide a master index to this topic or you can try the page top or bottom search box as a quick way to find information you need. Exhausting of the bath vent fan must indeed be to the building exterior.

Then use a screw to secure the duct connector to the edge of the hole so that it will line up with the exhaust on the fan housing. The metal visible below the exhaust duct was put in place to reinforce the supporting web between the i trusses. 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. Duct already wrapped in insulation at home centers.

The bath exhaust vent duct is routed through the ceiling between i trusses used to support the roof over the wall top to the building exterior into the soffit cavity. Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building.