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Engineering ToolBox > Air Change Rate
Air change rate per hour can be expressed in imperial Units as
n = 60 Q / V (1)
where
r = 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
r = 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