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IMPORTANT: Exhaust back pressure measured by a manometer at each dryer exhaust duct area should
not exceed .3" of water column.
The duct work should be smooth inside with projections from sheet metal screws or other obstructions which
will collect lint. When adding ducts, the duct to be added should overlap the duct to which it is to be connected .
ALL duct work joints must be taped to prevent moisture and lint from escaping into the building. Inspection
doors should be installed at strategic points in the exhaust duct work for periodic inspection and clean-out of lint
from the duct work.
NOTE: Where the exhaust passes through a wall, ceiling, or roof made of combustible materials, the opening
must be 2 inches larger (all the way around) than the duct. The duct must be centered within this
opening.
a.Outside Duct Work Protection
1. To protect the outside end of the horizontal duct work from the weather, a 90º 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 180º turn to point the opening
downward. In either case, allow at least twice the diameter of the duct between the duct opening and
nearest obstruction.
IMPORTANT: DO NOT use screens, louvers, or caps on the outside opening of exhaust duct work.