Air Flow Rate Calculator

The Air Flow Rate Calculator is a tool designed to assist HVAC contractors in calculating the flow rate of air through a duct or pipe based on the diameter of the duct and the velocity of the air moving through it. This calculator helps HVAC professionals determine how much air is being moved within a system, which is essential for ensuring proper ventilation and system efficiency.

How It Works:

1. Diameter Input:
   • The user provides the diameter of the duct or pipe in which the air is flowing.
   • The unit of the diameter can be selected from a dropdown menu, offering options such as inches, feet, millimeters, meters, etc.
2. Velocity Input:
   • The velocity at which the air is moving through the duct is also required.
   • The user selects the velocity unit from options like feet per second (fps) or meters per second (mps).
3. Calculation:
   • When the "Calculate" button is pressed, the calculator converts the entered diameter and velocity values into a standard unit of measurement.
   • Using the cross-sectional area of the duct (calculated based on the diameter) and the velocity, the flow rate is determined using the formula:

Formula:

Q = A × V

Where:

• Q is the flow rate.
• A is the cross-sectional area of the duct (π × (radius²)).
• V is the air velocity.

Results:

• The calculator displays the calculated flow rate in various units, such as cubic feet per second (CFS), gallons per minute (GPM), cubic meters per hour (CMH), and liters per second (LPS).
• This allows HVAC professionals to easily interpret the results in different measurement systems, depending on the application.