HVAC Ductwork Size Calculator
Calculate HVAC duct sizes from CFM and velocity.
Round Duct Diameter
10.2 in
Rectangular (12" deep)
6.9 × 12 in
Cross-section Area
82.3 in²
Air Flow
400 CFM
Air Velocity
700 FPM
Calculate HVAC duct sizes from CFM and velocity.
Round Duct Diameter
10.2 in
Rectangular (12" deep)
6.9 × 12 in
Cross-section Area
82.3 in²
Air Flow
400 CFM
Air Velocity
700 FPM