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Exhaust fan through roof.
This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.
The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.
Belt driven exhaust fans handle large volumes of air at low static pressures.
Duct already wrapped in insulation at home centers.
The master bathroom and the 2nd bathroom vent through the roof and through the same opening.
The 2nd bathroom vent drips on the floor and is ruining the ceiling.
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Over there mount the vent hood using tri polymeric locking seal paste and put the nails to strengthen it.
Exhaust fans mount through a cutout in a roof or wall.
They run more quietly and allow greater control over fans speeds than direct drive exhaust fans.
To vent a bath fan through the roof you must first prepare a ductwork connecting the roof top to the bathroom.
Table of contents show.
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.
Then drill a hole on the roof top.