Enter the volume air flow rate and the face area into the calculator to determine the face velocity.

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## 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