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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 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)
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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