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Air change rate equations in imperial and SI units
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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 = air flow through the room (Cubic Feet per Minute, m3/h)
V = volume of the room (Cubic Feet, m3)
Air change rate expressed in SI-units:
n = q / V (2)
where
r = air change rate per hour
q = air flow through the room (m3/h)
V = volume of the room (m3)
With an air flow of 10.000 m3/h in a 20.000 m3 room the air flow rate can be calculated as
n = 10.000 (m3/h) / 20.000 (m3)
= 0.5
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