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Useful Equations and Conversions
AREA equation for rectangular or square ducts
Width (W)
Area equation for circular ducts
Cubic equations
must be converted to feet or meters before using the above formulae.
Unit of Measure Conversion Table
1 m/s
1 ft/min
1 knot
1 km/h
1 MPH
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Height (H)
Radius
CFM (ft
3
/min) = Air Velocity (ft/min) x Area (ft
CMM (m
3
/min) = Air Velocity (m/sec) x Area (m
NOTE: Measurements made in inches
m/s
ft/min
1
196.87
0.00508
1
0.5144
101.27
0.2778
54.69
0.4464
87.89
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Area (A) = Width (W) x Height (H)
π
2
Area (A) =
x r
π
= 3.14 and r
Where
knots
1.944
0.00987
1
0.54
0.8679
8
2
= radius x radius
2
)
2
) x 60
km/h
MPH
3.6
2.24
0.01829
0.01138
1.8519
1.1523
1
0.6222
1.6071
1
AN510-en-GB_V1.0 5/17
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