Calcolatore Velocità nei Canali Gratuito
Calcola la velocità dell'aria nei canali di aerazione in base a portata e sezione.
CFM
in
Air Velocity
859 ft/min
Duct Area50.3 sq in
Noise Risk0
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.
Esempio Risolto
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.
Domande Frequenti
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.
Impara