Air Duct Flow Calculator SI Units air velocity (m/s) diameter (m)or alternatively side length – a (m) side length – b (m) Imperial Units air velocity (ft/min) diameter (in)or alternatively side length – a (in) side length – b (in) Scroll to top Scroll to top HomeCalculatorsProjectsToggle child menuExpand Python ProjectsContact usAbout Us Toggle Menu Close Search for: Search