Flanged Hood Capture Velocity

Flanged Hood Capture Velocity

VE-10
ASPCSPAdvanced

Formula
Q = 0.75V(10x² + A)
When to Use

Calculate airflow for a flanged hood. Flanges reduce required airflow by ~25% compared to unflanged hoods.

Symbol Legend
SymbolMeaningUnitNote
QRequired airflowcfm
VRequired capture velocity at distance xfpm
xDistance from hood face to sourceft
AArea of hood openingft²
0.75Flange efficiency factor25% less air than unflanged

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