Mechanical
Duct Sizing
Sizes a duct for a target air velocity, then converts the equivalent round diameter to a rectangular section for the given aspect ratio.
Equal-velocity method · Huebscher equivalent diameter
Inputs
Results
Round duct diameter
15.6 in
Rectangular duct
21 × 10 in
- Free area required
- 1.333 ft²
- Velocity in rectangular duct
- 820 FPM
- Duct perimeter
- 5.13 ft