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SAR-GB • Circular sound attenuators with baffle

  • Circular
  • Galvanized steel
  • with baffle

Circular sound attenuator with baffle, duct in galvanized steel with insulation thickness of 100 mm sheathed in a dust cover for air speeds up to 20 m / s

Attenuation values according to DIN EN ISO 7235 (63, 125, 250, 500, 1k, 2k, 4k, 8k [Hz])

Application

  • For noise reduction in round air ducts
  • Reducing noise produced by fans
  • Reducing flow noises from flow regulators or other channel components
  • Can be used as a damper to prevent sound transfer trough the ducting between rooms

Composition

  • Circular silencers are designed with an external galvanised duct system
  • Insulation with thickness 100 mm (SAR-GB100)
  • Inner casing is made of perforated sheet steel
  • The void between the two is filled with sound-absorbing non-combustible mineral wool according to DIN4102 A2, specific mass> 20 kg / m³, building material class A2
  • Mineral wool certified according to RAL GZ 388
  • Connection to circular air ducts according to DIN EN 1506 or DIN EN 13180
  • Class D airtight connection with EPDM rubber according to DIN EN 12237
  • Airtight connection class D with EPDM rubber according to DIN EN 12237

Mounting

  • The attenuators should be mounted using duct suspension clamps, type OBMC, around the duct connection DN

Order example

SAR-GB100 315 L=600mm
Explanation:
SAR-GB = Type of sound attenuator with internal baffle
100 = Thickness of insulation in mm
315 = Connection diameter in mm
600 = Length in mm

Sound attenuation values

I = 100 mm
SAR-GB 100[dB] 
DND [mm]L [mm]63 Hz125 Hz250 Hz500 Hz1000 Hz2000 Hz4000 Hz8000 Hz[kg]
3155006003613202522171516
3155009005917264237252023
315500120051022345251322430
3555606003510162724161217
3555609005816254136241926
35556012005921335150312334
400600600349162014101020
4006009005614243122151531
40060012005816304232211842
4506309004513233021141435
45063012004715294131201747
5007109004512202315111240
50071012004614273421141553
56080012003513263320131459
63080012003411232414111263
71090012002411211711101071
8001000120023102016109982

  • I = Insulation jacket thickness in mm
  • DN = Nominal connection diameter of silencer in mm
  • D = Outside diameter in mm
  • L = Length in mm
  • Δ Ptot = Δ PL x [(ρ x v²) / 2] x L
    • Δ Ptot = Total pressure loss in Pascal
    • Δ PL = Average total pressure loss coefficient ζ/m
    • P = Specific weight = 1.2041 kg/m³
    • v = Air velocity in m/s
    • L = Length in meters

Pressure loss

ΔPt (Pa/m)
DNQ (m³/h)
1000200030004000500060007000800090001000011000120001300014000
3151350100           
3558234870101         
4003922485880100       
450 612203043587287101    
500 37111825334352657895  
560  4711152126334049606677
630   68111418222732374150
710     468101214172024
800        5678912

  • ΔPt = Total pressure loss in Pa / m
  • DN = Nominal connection diameter of the silencer in mm
  • Q = Air flow in m³ / h

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