Extech Instruments AN200 User Manual download pdf (Page 13)

AN200-EU-EN-V2.5-6/13

13

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

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Width (W)

Height (H)

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

CFM (ft

3

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

2

)

CMM (m

3

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

2

) x 60

Radius

Area (A) =

x r

2

Where = 3.14 and r

2

= radius x radius

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