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Extech Instruments AN500 User Manual page 9

Hot wire cfm/cmm thermo-anemometer
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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
Cubic equations
Units Conversion Table
1 m/s
1 ft/min
1 knot
1 km/hr
1 MPH
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2
= ft
H
W
A = W x H
3
CFM (ft
/min) = Air Velocity (ft/min) x Area (ft
3
CMM (m
/min) = Air Velocity (m/sec) x Area (m
m/s
ft/min
1
196.85
0.00508
1
0.5144
101.27
0.2778
54.68
0.447
88
Copyright © 2013 FLIR Systems, Inc.
3
/min (CFM)
R
A = pi x R
knots
1.944
0.00987
1
0.54
0.869
www.extech.com
9
2
2
)
2
) x 60
km/hr
3.6
0.01829
1.852
1
1.6093
AN500-EU-EN v1.5 1/13
MPH
2.237
0.01136
1.151
0.6214
1

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