What does FPM stand for in HVAC calculations?

What does FPM stand for in HVAC calculations?

• A. Feet per second
• B. Feet per minute
• C. Feet per mile
• D. Feet per meter

Answer: (B)

FPM stands for Feet Per Minute. In HVAC calculations, this unit expresses air velocity inside ducts. Knowing how fast the air is moving lets you size ducts and predict flow, because flow rate (in cubic feet per minute, CFM) comes from multiplying velocity by the duct’s cross-sectional area. For example, if air travels through a duct with an area of 4 ft² at 1,200 ft/min, the flow is 4,800 CFM. You can convert to other velocity units if needed, since 1 ft/min equals 1/60 ft/s, but FPM specifically means feet per minute. The other options aren’t standard velocity units used for HVAC airflow calculations.

FPM stands for Feet Per Minute. In HVAC calculations, this unit expresses air velocity inside ducts. Knowing how fast the air is moving lets you size ducts and predict flow, because flow rate (in cubic feet per minute, CFM) comes from multiplying velocity by the duct’s cross-sectional area. For example, if air travels through a duct with an area of 4 ft² at 1,200 ft/min, the flow is 4,800 CFM. You can convert to other velocity units if needed, since 1 ft/min equals 1/60 ft/s, but FPM specifically means feet per minute. The other options aren’t standard velocity units used for HVAC airflow calculations.