Air Flow Unit Conversion

Air Flow Conversion Formula:

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

Flow Rate (CFM):

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1. What is Air Flow Unit Conversion?

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

Purpose: It helps engineers, HVAC technicians, and fluid system designers 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 1 cubic foot equals 7.481 gallons, we multiply GPM by this factor to get CFM.

3. Importance of Flow Rate Conversion

Details: Accurate unit conversion ensures proper system design, equipment selection, and performance calculations in fluid systems.

4. Using the Calculator

Tips: Simply enter the flow rate in gallons per minute (GPM). The calculator will automatically compute the equivalent in cubic feet per minute (CFM).

5. Frequently Asked Questions (FAQ)

Q1: Why is 7.481 the conversion factor?
A: This is the exact number of US gallons in one cubic foot (1 ft³ = 7.48051948 gallons, typically rounded to 7.481).

Q2: When would I need to convert GPM to CFM?
A: Common in HVAC systems, pump sizing, and when comparing specifications that use different units.

Q3: Does this work for any fluid or just water?
A: This conversion is purely about volume flow rate and works for any fluid, though the actual mass flow rate would depend on density.

Q4: How precise is this conversion?
A: The conversion factor is mathematically exact, though practical measurements may have instrumentation errors.

Q5: Can I convert CFM back to GPM?
A: Yes, simply divide CFM by 7.481 to get GPM.