Air Velocity from Velocity Pressure

Air Velocity from Velocity Pressure

VE-02
ASPCSPFoundational

Formula
V = 4005 × √VP
When to Use

Convert velocity pressure measurement (from a Pitot tube) to air velocity.

Symbol Legend
SymbolMeaningUnitNote
VAir velocity in ductfpm
4005Constant based on density of standard airAt 70°F and 1 atm
VPVelocity pressure )inches of water gauge (″wgAlways positive

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