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GENERAL DUCT WEIGHTS
The average weight of the duct, per foot of length, can be calculated using the following formulas below.
Duct design should provide adequate support to ensure duct components are not overloaded.
Weight – DW-2R
The following formula can be used to approximate the weight of total length of DW-2R double wall duct.
Inner Shell + Outer Shell + Insulation or (.0327*L*D) + [.0218*L*(D+4)] + [.0364*L*(D+2)].
Weight – DW-3R
The following formula can be used to approximate the weight of total lengths of DW-3R double wall duct.
Inner Shell + Outer Shell + Insulation or (.0327*L*D) + [.0218*L*(D+6)] + [.0436*L*(D+3)].
Weight – DW-3Z
The following formula can be used to approximate the weight of total lengths of DW-3Z double wall duct.
Inner Shell + Outer Shell + Insulation or (.0327*L*D) + [.0218*L*(D+6)] + [.0491*L*(D+3)].
Weight – Example
The “D” value in the formulas above represents the inner duct diameter in inches. The “L” value in the
formulas above represents the total length in inches. Duct system: DW-3Z, 12” inner duct, 100 FT long.
Using the DW-3Z formula above, (.0327*1200*12) + (.0218*1200*18) + (.0491*1200*15) = 1825 lbs.
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