Air Exchange Rate

The rate at which outside air replaces indoor air in a given space.

The air exchange rate is:


n = air change rate per hour [h-1]
q = fresh air flow through the room [m3s-1]
V = volume of the room [m3]

A minimum value of 4 is recommended. Note that local regulations may stipulate a value depending on the use of the room.

See also: Flow Rate.

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Subjects: Civil Engineering