Air Flow Conversion Calculator

Air Flow Conversion Formula:

\[ Q_{cfm} = Q_{gpm} \times 7.481 \]

Flow Rate (CFM):

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1. What is an Air Flow Conversion Calculator?

Definition: This calculator converts air flow rate from gallons per minute (GPM) to cubic feet per minute (CFM).

Purpose: It helps HVAC professionals, engineers, and technicians convert between these common flow rate units.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ Q_{cfm} = Q_{gpm} \times 7.481 \]

Where:

\( Q_{cfm} \) — Flow rate in cubic feet per minute
\( Q_{gpm} \) — Flow rate in gallons per minute
7.481 — Conversion factor (gallons per cubic foot)

Explanation: Since there are 7.481 gallons in a cubic foot, multiplying GPM by this factor converts to CFM.

3. Importance of Flow Rate Conversion

Details: Proper flow rate conversion ensures accurate system design, performance calculations, and equipment selection in HVAC and fluid systems.

4. Using the Calculator

Tips: Enter the flow rate in GPM. The value must be > 0. The calculator will automatically compute the equivalent CFM.

5. Frequently Asked Questions (FAQ)

Q1: Why is 7.481 the conversion factor?
A: There are exactly 7.48052 gallons in one cubic foot, which we round to 7.481 for practical calculations.

Q2: When would I need to convert GPM to CFM?
A: When working with air flow specifications that use different units or comparing systems that use different measurement standards.

Q3: Is this conversion affected by temperature or pressure?
A: No, this is a straightforward volume conversion. For mass flow rates or actual flow conditions, additional factors would be needed.

Q4: Can I convert CFM back to GPM with this?
A: Yes, simply divide CFM by 7.481 to get GPM.

Q5: How precise is this conversion?
A: The conversion is mathematically exact, though practical applications may require rounding based on your specific needs.