Venting Bathroom Fan Through Existing Roof Vent

Options for venting a bathroom exhaust fan include best to worst.

Venting bathroom fan through existing roof vent.

Moisture though is the real problem since it can create potentially hazardous mold and mildew eating away at your walls ceiling and trim. Center the nail between two rafters. Venting two bathroom exhaust fans through one roof duct won t work sorry to say. This ventilation code specifies a bathroom exhaust airflow rate for toilet rooms and bathrooms not served by a window of adequate size of.

But you can install one fan in your attic for both bathrooms and make your bathroom quieter too. First you ll partially block your roof vent with the piping reducing the flow of cooling air through your attic. Smells are merely an annoyance. Second during cold winters you ll be blowing warm moist air onto a cold surface the roof vent and roof plywood.

25 or 50 cfm ft for hotels motels resorts and dormitories and a slightly more modest 20 50 cfm for private dwellings. Required bathroom vent fan ventilation rate in cfm. From inside the attic drive a nail through the roof directly above the bathroom vent fan. From the roof find the nail and use the utility knife to cut roof shingles from around the nail.

Bathroom exhaust fans perform an important function by removing excess moisture from your home. Sometimes this is preferable to do so that the roof doesn t need to be disturbed and then at a later date when replacing the roof a proper vent is added. Bathrooms can only benefit from some type of exhaust venting system but which type do you need and what does the bathroom exhaust fan venting. This involves running ductwork from the fan usually though an attic and out through the roof.

By the diy experts of the family handyman magazine one fan two vents. In order to accomplish this the roof has to have a hole cut in it. In this video this old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. Bathrooms are wet smelly places that often are closed in and unventilated.

However it is possible to use the existing roof vent often the duct is secured to one side of the roof vent so that it can still be used for attic ventilation. 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.