Air Velocity Calculator

Calculate air velocity based on flow rate and duct area to determine airflow efficiency in ventilation systems.

Input Parameters

Calculation Results

Calculation Formula

Air Velocity (V) = Flow Rate (Q) / (Duct Width × Duct Height)

Where:
V = Air Velocity (feet per minute)
Q = Flow Rate (CFM)
Duct Width = Duct width in feet
Duct Height = Duct height in feet

Based on calculated velocity, recommendations will appear here

Air Velocity Calculator Usage Guide

Learn how to use the Air Velocity Calculator and understand its importance in ventilation systems

How to Use This Calculator

  1. Enter the required flow rate in CFM (Cubic Feet per Minute) - this is the amount of air moving per minute.
  2. Input the width of your duct in feet.
  3. Enter the height of your duct in feet.
  4. Click the "Calculate" button to determine the air velocity.
  5. Review the recommendation based on the calculated velocity.

Understanding Air Velocity

Air velocity is a critical parameter in ventilation systems. It represents how fast air is moving through a space or ductwork. The appropriate air velocity depends on the application:

  • General ventilation: 50-200 fpm (feet per minute) is typically recommended
  • Cooling applications: May require higher velocities (100-400 fpm)
  • Heating applications: Often lower velocities (50-150 fpm)
  • Exhaust systems: Velocities can vary widely based on application

Why This Matters

Optimizing air velocity is crucial for:

  • Efficient heat transfer
  • Proper air distribution
  • Minimizing noise and vibration
  • Ensuring adequate air movement for occupant comfort
  • Preventing dust and particle buildup

Note: This calculator provides basic recommendations. For complex systems, consult with HVAC professionals or refer to ASHRAE standards.