Air Change Rate

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Air Change Rate - Imperial Units

Air change rate per hour can be expressed in imperial Units as

n = 60 q / V         (1)

where

n = air change rate per hour

q = fresh air flow through the room (Cubic Feet per Minute,  cfm)

V = volume of the room (Cubic Feet)

Air Change Rate - SI Units

Air change rate expressed in SI-units:

n = 3600 q / V         (2)

where

n = air change rate per hour

q = fresh air flow through the room (m³/s)

V = volume of the room (m³)

Example - Air Change Rate SI Units

With an air flow of 3 m³/s in a 20000 m³ room the air flow rate can be calculated as

n = 3600 (3 m³/s) / (20000 m³)

= 0.54

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