I prefer to run a bath vent to outdoors via a horizontal line that goes across an attic and out through a gable end wall or one that vents down and outside through a roof overhang or soffit.
Bathroom exhaust fan through flat roof.
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If you have access to the attic the fan can vent either through a gable wall or roof.
This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.
Vent your bath and kitchen exhaust fans through the roof through a special roof hood.
The warm air will exhaust out the duct and enter back into the attic through the soffit vent or ridge vent.
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Letting the fan exhaust into an open attic will cause moisture buildup on the underside of the roof.
It also indicates that on sloped roof the termination should be.
Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.
Avoid venting through a soffit vent or ridge vent.
Bath exhaust fans routed up through the roof.
Our state s weatherization field guide indicates that vent terminations shall not be allowed on flat roofs.
I am interested in learning if there is guidance or code that would cover venting a bath fan straight up through a flat roof.
The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.
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This discussion is now found at bathroom vent up through roof.
My interpretation is that you are not allowed to place a fan vent termination on a flat roof.