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IMPORTANT: For extended duct work runs, the cross section area of the duct work can only be
increased to an extent. Maximum proportional duct work runs cannot exceed
twenty (20) feet more than the original limitations of twenty (20) feet with two (2)
elbows. When the duct work approaches the maximum limits as noted in this manual,
a professional heating venting air conditioning (HVAC) firm should be consulted
for proper venting information.
ALL 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.
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.
It is suggested that the duct work from each dryer not exceed twenty (20) feet with no more than two (2)
elbows (excluding dryer connections). If the duct work exceeds twenty (20) feet or has numerous elbows,
the cross sectional area of the duct work must be increased in proportion to the length and number of elbows
in it. In calculating duct size, the cross-sectional area of a square or rectangular duct must be increased
twenty percent (20%) for each additional twenty (20) feet. The diameter of a round exhaust duct should be
increased ten (10) percent for each additional fifteen (15) feet. Each 90º elbow is equivalent to an additional
forty (40) feet, and each 45º elbow is equivalent to an additional twenty (20) feet.