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FPM to CFM Conversion Formula:
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FPM to CFM conversion calculates the volumetric flow rate (CFM - cubic feet per minute) from velocity (FPM - feet per minute) and cross-sectional area. This is essential in HVAC, ventilation systems, and fluid dynamics applications.
The calculator uses the conversion formula:
Where:
Explanation: The formula converts linear velocity to volumetric flow rate by multiplying by the area through which the air or fluid is moving.
Details: CFM calculation is crucial for designing ventilation systems, determining air flow requirements, sizing ducts and fans, and ensuring proper air exchange rates in buildings and industrial applications.
Tips: Enter velocity in feet per minute and area in square feet. Both values must be positive numbers. The calculator will provide the flow rate in cubic feet per minute.
Q1: What's the difference between FPM and CFM?
A: FPM measures velocity (speed of air movement), while CFM measures volumetric flow rate (amount of air moving through a space per minute).
Q2: When is this conversion most commonly used?
A: Primarily in HVAC design, ventilation system calculations, industrial exhaust systems, and air flow analysis in ducts and pipes.
Q3: How accurate is this conversion?
A: The conversion is mathematically exact for uniform flow across the entire cross-sectional area. Real-world applications may require adjustments for turbulence and flow variations.
Q4: Can this be used for liquids as well as air?
A: Yes, the principle applies to any fluid, though units may need conversion for different measurement systems.
Q5: What factors affect the accuracy of CFM calculations?
A: Duct shape, surface roughness, temperature, pressure, and flow uniformity can all impact actual CFM values compared to theoretical calculations.