Flow Rate (Q = AV)

Flow Rate (Q = AV)

VE-01
ASPCSPFoundational

Formula
Q = A × V
When to Use

Calculate volumetric airflow rate in ducts and hoods. The most fundamental ventilation equation.

Symbol Legend
SymbolMeaningUnitNote
QVolumetric flow rate or m³/s)cfm (ft³/min
ACross-sectional area of duct or openingft² or m²
VAir velocity in ductfpm or m/s

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