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It is suggested that the use of 90º turns in ducting be avoided; use 30º or 45º angles instead. The duct
work 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 duct work 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 duct work for
periodic inspection and cleaning.
Wherever the exhaust duct work passes through a wall, ceiling, or roof made of combustible materials,
the opening must be 2-inches (5.08 cm) larger (ALL the way around) than the duct. The duct must be
centered within this opening.
IMPORTANT: If the duct work run (distance) or the amount of elbows required exceeds the limits
noted in this manual, the size (diameter/cross-sectional area) of the duct work can only
be increased to an extent. When the duct work approaches the maximum limits as
noted in this manual, a professional Heating, Venting, Air Conditioning (HVAC) firm
must be consulted for proper venting information.