Appendi x A: K-factors
To set up a VAV controller, a K-factor must be entered into the controller. Typically, this is
part of the airflow chart that the manufacturer places on the VAV unit. If this information is
missing and not available from the manufacturer, use the K-factor in the following chart.
Duct size in inches K-factor, CFM K-factor, LPS
4 265 8
5 357 11
6 460 14
7 652 19
8 890 27
9 1145 34
10 1443 43
12 1972 59
14 2771 86
16 3741 111
24 x 16 6980 208
Table A–1 Start point K factors
SimplyVAV
Revision H 71
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