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Blauberg SD 40x20

Silencer for rectangular duct.
EAN codeEAN4058448039096
  • Description
  • Characteristics
  • Downloads
  • Dimensions
  • Designation key
  • Noise level reduction
  • Pressure drop diagram

For attenuation of the noise produced by a ventilation system and spreaded along ventilation ductworks. Used jointly with sound-insulated fans in premises with high requirements to noise level produced by ventilation equipment. Compatible with 400x200 mm up to 1000x500 mm rectangular air ducts.


Galvanized steel case and sleeves. The plates are filled with non-flammable sound-absorption material with protecting coating to prevent fiber blowing.


Fixing to rectangular ducts with flange connection. For maximum sound absorption capacity provide a straight air duct section at least 1 m long towards the silencer. For better sound absorption install the silencers in series.

Parameter SD 40x20 Measurement unit
Connected air duct size 400х200 mm
Weight 18.5 kg
Casing material galvanized steel -
Air duct for rectangular air ducts -
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SD (rectangular) - data sheet (pdf 336.84Kb)
SD (rectangular) - image (png 578.45Kb)

Model Overall dimensions [mm]
B B1 B2 H H1 H2 L
SD 40x20 400 420 440 200 220 240 950
Designation key
Designation key
Series Flange size (WxH) [cm]
SD 40x20; 50x25; 50x30; 60x30; 60x35; 70x40; 80x50; 90x50; 100x50
Noise level reduction
Noise level reduction
Model 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz
SD 40x20 3 7 10 23 27 30 25 22
Pressure drop diagram
Pressure drop diagram