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c. Outside Duct (Vent) Work Protection
To protect the outside end of the horizontal duct work from the weather, a 90º elbow turned downward
should be installed where the exhaust duct exits the building. If the duct work travels vertically up
through a roof, it should be protected from the weather by using a 180º turn (goose neck) to point the
opening downward. In either case, allow at least twice the diameter of the duct between the duct
opening and the nearest obstruction.
IMPORTANT: DO NOT use screens or caps on the outside opening of the exhaust duct work.