Duct sizing for both rectangular and circular ducts. Tap on the values for velocity or friction to switch between calculation methods. Users can change between I-P and S-I units by tapping the toggle switch at the top. The detailed sizing mode allows the Engineer to adjust the duct dimensions and air flow rates, while checking the resulting friction rate and velocity which update automatically. Detailed sizing mode is typically used to analyse existing duct systems. Calculations are based on standard air 0.075 lb/ft3 (1.2 kg/m3) in clean galvanized steel duct. Any feedback is welcome, and will be the basis for future updates.
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