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A(z) Duct Sizing kiszámítása

Mi az a Duct Sizing?

HVAC Duct Sizing Calculator helps contractors and tradespeople accurately size, spec, and estimate materials and systems.

Képlet

Duct Area = CFM / (FPM velocity) where FPM = 700-900 for mains

Útmutató lépésről lépésre

  1. 1Calculate required CFM per room, size duct for target velocity
  2. 2Apply the formula using your project measurements
  3. 3Add required safety factors or waste allowances per code

Worked Examples

Bemenet
400 CFM, 800 FPM target
Eredmény
Area = 400/800 = 0.5 sf → 8×9 inch duct

Common Mistakes to Avoid

  • Not applying code-required safety factors or derating
  • Forgetting to account for waste and cut losses in material estimates

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