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Equivalent pipe length in m for selected single resistances :
90 degrees smooth bend R/D = 2 : 2.1
90 degrees angular bend R/D = 2 (three sections) : 2.6
90 degrees angular bend R/D = 2 (five sections) : 2.1
In general, we recommend that the pressure loss in the exhaust pipe is kept as low as possible.
If more machines are to be connected to the same exhaust channel, it is necessary to contact a ventilating firm that can advise you with regard to the correct dimensioning of the exhaust channel.
The pressure loss in the exhaust channel can be calculated in the following way :
Pchannel = Pd + Iength channel x ∆p
If Pchannel > 300 Pa, we recommend to increase the pipe dimension.
For this purpose, a prefabricated transfer piece is to be used.
To avoid noise, we advise to keep the maximum velocity in the pipe under 12 m/sec.
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