ADC ML-145 Installation And Operator's Manual page 20

a.Outside Duct Work Protection
1) To protect the outside end of horizontal duct work from the weather, a 90° elbow bent downward should
be installed where the exhaust exits the building. If the exhaust duct work travels vertically up through the
roof, it should be protected from the weather by using a 180° turn 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 of opening of exhaust duct work.
16