q = fresh air (make up 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)
n = air changes per hour
q = fresh air (make up 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 change rate can be calculated as
n = 3600 (3 m3/s) / (20000 m3)
= 0.54 (h-1)
Typical air changes per hour for well-insulated spaces:
Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.
Fresh air (make up air) rquirements - or recommended air change rates (ACH) for typical rooms and buildings like auditoriums, kitchens, churches and more.
Exhaust ventilation from garages and workshops.
Recommended supply air rates of outdoor air - with or without smoking - in rooms like banks, assembly halls, hotels and many more.
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