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Why does the air velocity shown in the Air Flow Performance Data (AFPD) chart in your catalog differ from the cfm per square foot value?

April 26, 2017afpd air catalog chart Data differ flow PERFORMANCE velocity

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Why does the air velocity shown in the Air Flow Performance Data (AFPD) chart in your catalog differ from the cfm per square foot value?

1 Answer

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10 Posted

The chart lists the air velocity measured in the lab while the cfm per square foot value, called the average face velocity, is calculated by dividing the total air volume (cfm) by the nominal active diffuser area.