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Blauberg SD-400

  • Description
  • Characteristics
  • Downloads
  • Modifications
  • Dimensions
  • Noise level reduction
The silencer is used for attenuation of the operation noise generated by ventilation equipment and spreaded in the the air ducts. Designed for connection to round air ducts.   The SD silencer has a polymer-coated steel casing filled with noncombustible material that has a protective coating to prevent fiber deformation.
Parameter SD-400-1D SD-400-1.5D SD-400-2D Measurement unit
Weight 9.5 13.1 16.7 kg
Documents archieve
Documents archieve
SD - image (png 210.63Kb)
SD - data sheet (pdf 222.63Kb)
Modification name

Model Overall dimensions [mm]
ØD ØD1 ØD2 Md n L
SD-400-1D 400 450 515 M6 12 402
SD-400-1.5D 602
SD-400-2D 802
Noise level reduction
Noise level reduction
The values shown in the tables represent the difference between the sound power level (Lw) of the combination of the fan, the attenuator and the power of one fan.   To determine the sound power level of the fan equipped with a silencer, the insertion loss must be subtracted from the rated sound power level (Lw) of the fan on the mid-frequency spectrum in the octave band given in the fan specifications.
Model Sound attenuation by frequency band [dB] LwA [dBA]
Sound-power level, A-weighted
63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz
SD-400-1D 2 3 5 9 13 10 8 7 17
SD-400-1.5D 3 5 8 13 17 14 12 10 21
SD-400-2D 4 6 10 16 21 18 15 13 25