16
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.
Содержание MD-170
Страница 24: ...20...
Страница 72: ...PartNo 113024 1 02 16 00 25 2 02 25 00 250...