Calculateur de Dimensionnement de Conduits Gratuit
Dimensionnez vos conduits de ventilation et climatisation. Calculez le diamètre optimal selon le débit d'air et la vitesse souhaitée.
Round Duct Diameter
10.2 in
Round Duct Diameter vs Airflow
Formule
Duct Sizing by Velocity
A = CFM / Velocity
Diameter = 2 x sqrt(A / pi)
Convert the area to diameter for round ducts. For residential trunk lines, maximum velocity of 700 ft/min keeps noise low. Branch runs can go up to 600 ft/min. Round up to the next standard duct size.
Exemple Résolu
400 CFM at a max velocity of 700 ft/min.
- 01Area = 400 / 700 = 0.571 sq ft = 82.3 sq in
- 02Diameter = 2 x sqrt(0.571 / pi) x 12 = 10.2 in
- 03Use a 10-inch round duct (or 12-inch for lower velocity).
Questions Fréquentes
What velocity is too high for residential ducts?
Above 900 ft/min in trunk lines and 700 ft/min in branches, duct noise becomes noticeable. Keeping velocities below these limits ensures quiet operation.
How do I convert round to rectangular ducts?
Use the equivalent diameter formula: De = 1.3 x (a x b)^0.625 / (a + b)^0.25, where a and b are the rectangular dimensions.
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