To determine duct velocity, divide the airflow rate (CFM) by the duct’s cross-sectional area (A). This allows you to assess airspeed in the duct, ensuring proper HVAC system design and efficiency.
The Duct Velocity Calculator is a valuable tool for measuring the speed of air moving through a duct. This is critical for HVAC professionals aiming to optimize system performance, prevent excessive noise, and maintain energy efficiency.
Formula
V = CFM / A
| Variable | Description |
|---|---|
| V | Velocity of air in the duct (feet per minute or meters per second). |
| CFM | Airflow rate (Cubic Feet per Minute). |
| A | Cross-sectional area of the duct (square feet or square meters). |
Solved Calculations
Example 1: Round Duct with 12-inch Diameter
| Step | Value |
|---|---|
| Diameter of duct | 12 inches (1 foot) |
| Cross-sectional area (A) | π × (0.5)² = 0.785 ft² |
| Airflow rate (CFM) | 800 |
| Velocity (V) | 800 / 0.785 = 1019 fpm |
Example 2: Rectangular Duct with 2×3 Feet Dimensions
| Step | Value |
|---|---|
| Dimensions of duct | 2 ft × 3 ft |
| Cross-sectional area (A) | 2 × 3 = 6 ft² |
| Airflow rate (CFM) | 1800 |
| Velocity (V) | 1800 / 6 = 300 fpm |
What is Duct Velocity | Instantly Calculate Duct Velocity, Measure Airflow Rate, Use This HAVC Duct Calculator 2025:
The Duct Velocity Calculator is a specialized tool that helps determine the speed of air flowing through a duct system, typically expressed in feet per minute (FPM) or meters per second (m/s).
It uses parameters like airflow (CFM) and duct dimensions to calculate the velocity, ensuring the efficient design and operation of HVAC systems.
Duct velocity is a critical factor in maintaining optimal airflow and energy efficiency. Excessively high velocities can cause noise and energy loss, while low velocities might result in inadequate ventilation.
For example, the calculator is useful in assessing whether a round or rectangular duct meets recommended standards such as those provided by ASHRAE.
By inputting duct dimensions and airflow rates, the calculator computes velocity to guide decisions on duct size and airflow balance. It also aids in converting between velocity, CFM, and pressure, which is valuable for engineers designing or troubleshooting ductwork.
This tool is indispensable for HVAC professionals, engineers, and contractors looking to ensure proper air distribution, reduce noise, and maintain energy efficiency.
Final Words:
Conclusively, the Duct Velocity Calculator simplifies airspeed calculations, ensuring precise and efficient ductwork designs. It’s a vital resource for optimizing HVAC performance and maintaining comfortable environments.
