Forced ventilation (cooling) for electrical cabinets.

Calculate the quantity of heat extracted by an electric-fan from a cabinet containing electrical and electronic equipments.

Data input

Maximum ambient temperature

°C

Maximum internal temperature

°C

Flow rate of the extractor fan

m³/h

Help for fan.

Some examples of air flows:

Fan type	W x H (mm)	m3/h
Axial	40 x 40	9.7
	60 x 60	21
	80 x 80	50
	92 x 92	80
	119 x 119	130
	127 x 127	250
	172 x 172	305
Centrifugal	15 x 51	9.6
	33 x 93	56
	127 x 117	80
	115 x 159	200
	253 x 83	115
	329 x 83	173
	395 x 83	200

Notes. The quantity of extracted air indicated must refers to the real, considering the pressure drop of the suction section which, being generally composed by a filter, worsens with time.

If You don't have the characteristic curve of the fan is acceptable half the nominal flow rate indicated by the constructor, it may be farther reduced caused by the pressure drop, expecially if we're talking about fan with low pressure head (e.g. axial fan).