Calculadora de Velocidade em Dutos Grátis
Calcule a velocidade do ar dentro dos dutos. Garanta um fluxo adequado e silencioso no sistema de ventilação.
Air Velocity
859 ft/min
Air Velocity vs Airflow
Formula
## Duct Air Velocity **V = CFM / A** Where A is the cross-sectional area of the duct in square feet. Convert the diameter from inches to feet before calculating the area. Residential duct velocity should stay below 700-900 ft/min to avoid noise.
Exemplo Resolvido
300 CFM through an 8-inch round duct.
- 01Area = pi x (8/24) squared = 0.349 sq ft
- 02Velocity = 300 / 0.349 = 860 ft/min
- 03This is borderline for noise; consider a 10-inch duct.
Perguntas Frequentes
What velocity causes noise?
Below 600 ft/min is quiet. 600-900 ft/min is acceptable. Above 900 ft/min produces noticeable noise. Supply registers should be under 500 ft/min.
How does velocity affect static pressure?
Higher velocity increases friction and pressure drop per foot of duct. This means the blower must work harder, reducing efficiency and increasing operating cost.
Aprender