SMACNA HVAC Duct Design Calculator - Imperial
Product Code/ISBN: 220044
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The SMACNA Duct System Calculator has detailed instructions and calculations to enable HVAC system designers to design an average duct system without additional references.
This is the only calculator in the industry to include the 0.0003 roughness factor duct friction loss data for designing straight, round or rectangular sheet metal ducts.
If you design or install in-place ductwork, you need the duct system calculator!