Model AN100 Version 2.0 02/06

9

Useful Equations and Conversions

Area equation for rectangular or square ducts

Area equation for circular ducts

Cubic equations

NOTE:

Measurements made in inches

must be converted to feet or meters before using the above formulae.

Unit of Measure Conversion Table

m/s

ft/min

knots

km/h

MPH

1 m/s

1

196.87

1.944

3.6

2.24

1 ft/min

0.00508

1

0.00987

0.01829

0.01138

1 knot

0.5144

101.27

1

1.8519

1.1523

1 km/h

0.2778

54.69

0.54

1

0.6222

1 MPH

0.4464

87.89

0.8679

1.6071

1

Width (W)

Height (H)

Area (A) = Width (W) x Height (H)

Radius

Area (A) =

Where