learn.howToCalculate
learn.whatIsHeading
HVAC Duct Sizing Calculator helps contractors and tradespeople accurately size, spec, and estimate materials and systems.
Formule
Duct Area = CFM / (FPM velocity) where FPM = 700-900 for mains
Stapsgewijze handleiding
- 1Calculate required CFM per room, size duct for target velocity
- 2Apply the formula using your project measurements
- 3Add required safety factors or waste allowances per code
Uitgewerkte voorbeelden
Invoer
400 CFM, 800 FPM target
Resultaat
Area = 400/800 = 0.5 sf → 8×9 inch duct
Veelgemaakte fouten om te vermijden
- ✕Not applying code-required safety factors or derating
- ✕Forgetting to account for waste and cut losses in material estimates
Klaar om te berekenen? Probeer de gratis Duct Sizing-rekenmachine
Probeer het zelf →