Air Velocity Calculator for HVAC Ducts
This air velocity calculator helps HVAC engineers calculate air velocity in ducts using airflow and duct size. Correct air velocity is important for efficient airflow, noise control, and proper HVAC duct design.
Air Velocity Calculator
What Is Air Velocity in HVAC?
Air velocity in HVAC refers to the speed at which air flows through a duct. It is usually expressed in feet per minute (FPM). Maintaining proper air velocity ensures good air distribution without excessive noise.
Air Velocity Formula
Air Velocity (FPM) = Airflow (CFM) ÷ Duct Area (sq.ft)
Where airflow is measured in cubic feet per minute (CFM) and duct area is measured in square feet.
Air Velocity Calculation Example
Assume:
- Airflow = 1200 CFM
- Duct area = 2.0 sq.ft
Air Velocity = 1200 ÷ 2.0 = 600 FPM
This velocity value can be compared with recommended HVAC duct velocity limits.
Why Air Velocity Is Important in HVAC Design
- Controls duct noise levels
- Ensures proper air distribution
- Helps in correct duct sizing
- Reduces energy losses
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Note: This calculator is for preliminary HVAC design and educational purposes only. Final design decisions should follow applicable standards and codes.
