The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.
Installing bathroom exhaust fan duct through roof.
Here in the north we vent the bathroom exhaust through a bulkhead to the exterior wall the exhaust ducting is insulated and has a slight slope to the exterior wall to allow any condensation to escape we also install a 5 6 length of plywood at the eaves so the exhaust can t get into the attic space.
The bathroom exhaust ventilation fan disperses air through an opening in the fan housing which is usually 3 inches in diameter and ideally faces in the direction of the ventilation system outlet.
Secure the fitting with foil duct tape.
Take the end of the duct with the connector fitting and attach it to bath vent fan.
I recommend that my clients vent their bath fans out a gable wall if at all possible when not using an hrv or erv that is.
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A 3 or 4 inch duct connects to the outlet on the fan housing and runs to a side wall or to the roof and connects to a vent cap that allows the exhaust to disperse outdoors.
In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover.
Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.
Pass the opposite end of the duct through the hole in roof.
If you vent through the roof condensation will drip back into the interior.
Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out.
Vent your bath and kitchen exhaust fans through the roof through a special roof hood.
We explain how to install bathroom exhaust fans or vents the vent ducting the vent termination at the wall soffit or roof vent fan wiring bath vent duct insulation bath vent lengths clearances routing and we answer just about any other bathroom ventilation design or installation question you may have.
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Next use aviation snips to cut slits into the sheet metal sleeve.