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HVAC Duct Sizing Calculator helps contractors and tradespeople accurately size, spec, and estimate materials and systems.
Formel
Duct Area = CFM / (FPM velocity) where FPM = 700-900 for mains
Steg-för-steg-guide
- 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
Lösta exempel
Ingång
400 CFM, 800 FPM target
Resultat
Area = 400/800 = 0.5 sf → 8×9 inch duct
Vanliga misstag att undvika
- ✕Not applying code-required safety factors or derating
- ✕Forgetting to account for waste and cut losses in material estimates
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