P&K 2714

Sound power of fans

Calculation form for the sound power of fans

Calculation of the noise of a blower or a fan emitted into a duct system or into the ambient air dependent on the type of fan, on the air volume and on the pressure difference.

Lw=A+10*lg(V)+B*lg(D) (Lärmbekämpfung, Kurtze e.a. 1975)


Descriptor is a user defined text, which will be transfered, by pressing OK, together with the results into the appropriate tables.

Air volume (V) [m3/h]

Pressure difference (D) [mbar]

Emission type

Choice of:

  • backward curved blades in duct (A=34, B=18)
  • backward curved blades in environment (A=45, B=10)
  • forward curved blades in duct (A=24, B=24)
  • forward curved blades in environment (A=33, B=18)

Relative spectrum [dB]

see Relative spectrum

A-Emission level (Lw) [dB(A)]

Emission spectrum [dB]


Width :


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