Duct Air Velocity Calculator
Calculate air velocity from CFM and duct size. Free, instant.
How to Use Duct Air Velocity Calculator
1
Enter airflow in CFM.
2
Enter duct diameter.
3
Get air velocity in ft/min.
Frequently Asked Questions
What is ideal duct velocity?
Main ducts: 600–900 FPM. Branch ducts: 400–600 FPM.