The HVAC Duct System Calculator enables
system designers to design an average duct system!
This calculator, complete with detailed instructions, enables HVAC
system designers to design an average duct system without additional
references.
SMACNA's duct system calculator is the only one in the industry
to include the 0.0003 roughness factor duct friction loss data for
designing straight, round or rectangular sheet metal ducts. 1988.
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