Filter
Top Products
13
It is suggested that the use of 90º turns in ducting be avoided; use 30º or 45º angles instead. The
ductwork should be smooth inside with no 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 ductwork joints must be taped to prevent moisture and lint from escaping into the
building. Also, inspection doors should be installed at strategic points in the exhaust ductwork for
periodic inspection and cleaning.
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.
IMPORTANT: If the ductwork run (distance) or the amount of elbows required exceeds the limits
noted in this manual, the size (diameter/cross-sectional area) of the ductwork can only
be increased to an extent. When the ductwork approaches the maximum limits as
noted in this manual, a professional heating, ventilating, and air-conditioning firm must
be consulted for proper venting information.