Extech Instruments AN500 Guide de l'utilisateur télécharger pdf (Page 9)

AN500-en-EU_V1.7 9/14

Useful Equations and Conversions

Area equations

The volume of air flowing through a duct or vent can be determined by taking the area of the duct

in square units (i.e. square feet) and multiplying this value by the measured linear velocity (i.e., feet

per minute). This gives: ft/min x ft

= ft

/min (CFM)

Cubic equations

CFM (ft

/min) = Air Velocity (ft/min) x Area (ft

)

CMM (m

/min) = Air Velocity (m/sec) x Area (m

) x 60

Units Conversion Table

m/s ft/min knots km/hr MPH

1 m/s 1 196.85 1.944 3.6 2.237

1 ft/min 0.00508 1 0.00987 0.01829 0.01136

1 knot 0.5144 101.27 1 1.852 1.151

1 km/hr 0.2778 54.68 0.54 1 0.6214

1 MPH 0.447 88 0.869 1.6093 1

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Extech Instruments AN500 Guide de l'utilisateur Page 9