How To Vent Two Bathroom Fans Through The Roof

Through the roof depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. To vent a bath fan through the roof you must first prepare a ductwork connecting the roof top to the bathroom. Over there mount the vent hood using tri polymeric locking seal paste and put the nails to strengthen it.

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Nail the lower corners with roofing nails and tar the heads.

How to vent two bathroom fans through the roof.

Apply a bead of asphalt roof cement on the bottom of the vent. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. You mount a switch in each bathroom. Then drill a hole on the roof top.

This system is quiet too. Choosing a whole house fan. In order to accomplish this the roof has to have a hole cut in it. From inside the attic drive a nail through the roof directly above the bathroom vent fan.

This involves running ductwork from the fan usually though an attic and out through the roof. The 2nd bathroom vent drips on the floor and is ruining the ceiling. The 2 pipes one a 4 master and the other a 3 2nd do not go through the ceiling but into a common box that goes through the roof. Slide the vent under the shingles so they cover the top half of the vent flange.

The lower half of the flange sits on top of the shingles. The master bathroom and the 2nd bathroom vent through the roof and through the same opening. Center the nail between two rafters. A single exhaust exits through the roof figure a.

A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.

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