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Useful Equations and Conversions
Area equation for rectangular or square ducts
Height (H)
Area (A) = Width (W) x Height (H)
Width (W)
Area equation for circular ducts
Radius
Cubic equations
CFM (ft
3
/min) = Air Velocity (ft/min) x Area (ft
3
CMM (m
/min) = Air Velocity (m/sec) x Area (m
NOTE: Measurements made in inches
must be converted to feet or meters before using the above formulae.
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15
10
20
5
25
0
30
2
Area (A) =
x r
Where
= 3.14 and r
2
radius
2
)
2
) x 60
= radius x
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