11
IMPORTANT:
Exhaust back pressure measured by a Magnehelic in the exhaust duct
must be
no
less than 0 and
must not exceed
1.0 inch (2.48 mb) of water column (W.C.).
NOTE:
When the exhaust ductwork passes through a wall, ceiling, or roof made of combustible
materials, the opening
must be
2-inches (5.08 cm) larger than the duct (all the way
around). The duct
must be
centered within this opening.
a. Outside Ductwork Protection
1) To protect the outside end of the horizontal ductwork from the weather, a 90º elbow turned downward
should be
installed where the exhaust exits the building. If the ductwork 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 the nearest obstruction.
IMPORTANT:
DO NOT
use screens, louvers, or caps on the outside opening of the exhaust
ductwork.
Summary of Contents for AD-670 Phase 7
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