Enter the volume air flow rate and the face area into the calculator to determine the face velocity.
- All Velocity Calculators
- Air Velocity Calculator
- Duct Velocity Calculator
- Water Velocity Calculator
- Compressed Air Velocity Calculator
Face Velocity Formula
The following equation is used to calculate the Face Velocity.
FV = AF / FA
- Where FV is the face velocity (ft/s)
- AF is the air flow rate (ft^3/s)
- FA is the face area (ft^2)
To calculate the face velocity, divide the volume flow rate by the face area.
What is a Face Velocity?
Definition:
A face velocity is a measure of the speed of the air moving through the inlet or outlet of an HVAC system.
How to Calculate Face Velocity?
Example Problem:
The following example outlines the steps and information needed to calculate Face Velocity.
First, determine the face area. In this example, the face area is found to be 5 ft^2.
Next, determine the air flow rate. For this problem, the air flow rate is 75 ft^3/s.
Finally, calculate the Face Velocity using the formula above:
FV = AF * FA
FV = 75 / 5
FV = 15 ft/s
