Design a duct system without any other references!

This calculator, complete with detailed instructions, enables HVAC system designers to design an average duct system without additional references. 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.

Other versions of SMACNA- Duct System Calculator are also Available:
SMACNA- Duct System Calculator - Imperial