Formula & worked example
Vface=CFM/Aface; Arequired=CFM/Vtarget.
10,000 CFM across a 5 ft × 4 ft coil gives 500 fpm face velocity.
HVAC & plant engineering calculator · Updated Sep 17, 2026
Cooling Coil Face Velocity Calculator — Airflow, Face Area & Carryover Check
Calculate cooling-coil face velocity from airflow and coil dimensions, reverse-size required face area from a target velocity and flag entered carryover-limit exceedance.
Inputs
Live engineering result
Gross face area 20 ft²
Face velocity 500 fpm
Required area at target 22.222222 ft²
Equivalent square side 4.7140452 ft
At or below entered carryover limit
Assumptions & limits
- Uses gross coil face dimensions.
- Actual moisture carryover limit depends on coil geometry, fin spacing, eliminators and manufacturer selection data.
Frequently asked questions
What does this Cooling Coil Face Velocity Calculator calculate?
Calculate cooling-coil face velocity from airflow and coil dimensions, reverse-size required face area from a target velocity and flag entered carryover-limit exceedance.
Can I use this for final design?
Use it as an auditable engineering sizing cross-check. Final equipment and piping selections should use project design conditions, manufacturer data, applicable standards and local code.
Why are the engineering assumptions shown?
Plant calculations are sensitive to fluid properties, pressure, temperature and operating hours. Exposing assumptions makes the result easier to verify instead of hiding them behind a single answer.