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Ventilation Air Exhange and Nomographs

ventilation nomograph.GIF (11034 bytes)

Ventilation Air Exchange Chart

It is recommended to have a rate of at least 20 air exchanges per hour.

Confined Space Volume
(Cubic Feet)

Blower Cubic Feet Per Min. (CFM)
Output Needed*

1000

 333
2000 667
3000 1000
4000 1333
5000 1667
6000 2000
7000 2333
8000 2667
9000 3000
10000 3333
*Take into account 90º bends of ducting, consult manufacturer's specs.
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