What is CFM, SCFM, ACFM, Am³/hr and N m³/hr?

CFM is a unit of flow rate (cubic feet per minute)

SCFM is a unit of flow rate (Standard Cubic Feet per Minute) at STP condition i.e. standard temperature 60º F and standard pressure 14.69 A PSI.

ACFM (Actual Cubic Feet per Minute) is the actual flow at the operating temperature and pressure conditions.

Am³/hr (Actual Cubic Meter per hour) is the actual flow at the operating temperature and pressure conditions.

Nm³/hr (Normal Cubic Meter per hour) is normalized value of flow at NTP conditions i.e. flow at Normal Temperature 0º C and Normal Pressure 101.32 kPa condition.

Note : STP/NTP conditions are decided by different organizations/authorities as per their specifications.

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