Extech Instruments 451126 Guide de l'utilisateur télécharger pdf (Page 9)

451126-EN v2.1 07/13

Useful Equations and Conversions

Area equations

Cubic equations

CFM (ft

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

)

CMM (m

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

) x 60

Units Conversion Table

m/s ft/min knots km/hr 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/hr 0.2778 54.69 0.54 1 0.6222

1 mph 0.4464 87.89 0.8679 1.6071 1

Area = W x H

Rectangular Duct

Circular Duct



(A= 3.14 x R x R)

1 2 3 4 5 6 7 8 9 10 11

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Extech Instruments 451126 Guide de l'utilisateur Page 9