Face Velocity Calculator

Formula

To calculate the face velocity:

\[ FV = \frac{AF}{FA} \]

Where:

\(FV\) is the Face Velocity (ft/s)
\(AF\) is the Air Flow Rate (ft³/s)
\(FA\) is the Face Area (ft²)

Face Velocity Definition

Face velocity is a measure of the speed of the air moving through the inlet or outlet of an HVAC system. It is calculated by dividing the air flow rate by the face area through which the air passes.

Example Calculation 1

Let's assume the following values:

Air Flow Rate (\(AF\)) = 1200 ft³/s
Face Area (\(FA\)) = 40 ft²

Using the formula:

\[ FV = \frac{1200}{40} = 30 \text{ ft/s} \]

The face velocity is 30 ft/s.

Example Calculation 2

Let's assume the following values:

Air Flow Rate (\(AF\)) = 500 ft³/s
Face Area (\(FA\)) = 25 ft²

Using the formula:

\[ FV = \frac{500}{25} = 20 \text{ ft/s} \]

The face velocity is 20 ft/s.