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SMRF Duct silencer

SMRF – Silencers are straight round sound absorber for use in ventilation systems. Silencers reduce noise (sound) transmission by ducts. Silencers are placed between noise source and protected room. Silencers are fire resistant.



  • Connection diameters from 80 to 500 mm
  • Spiro design with blade sealing
  • Tested according to EN 1366-1, EN 12237 and EN ISO 11691
  • SMR is non-fire resistant variant of SMRF
  • Maximum pressure difference 1500 Pa
  • Maximum air speed of 12 m/s
  • Fire resistance classified acc. to EN 13501-3+A1 as EI30
    without protective distance
  • Insulation thickness 50 mm