Blauberg Silencer SD 125/600 – Round Duct Noise Attenuator Optimise your ventilation system’s comfort and performance with the Blauberg Silencer SD 125/600. Engineered for attenuation of duct-borne noise, it works in tandem with sound-insulated fans to deliver whisper-quiet airflow in residential, commercial and light-industrial settings. Robust Construction for Lasting Performance Galvanised steel casing resists corrosion and mechanical damage Filled with non-flammable mineral wool and covered to prevent fiber release Rubber-sealed flanges ensure airtight connections and eliminate leaks Available in multiple lengths to suit diverse duct runs Superior Acoustic Absorption Featuring a perforated inner core and 50 mm acoustic lining, the SD 125/600 silencer delivers targeted noise reduction where it matters most. Peak attenuation reaches 15 dB at 500 Hz and 28 dB at 1 kHz, dramatically lowering fan whine and HVAC hum without impeding airflow. Easy Installation & Flexible Placement Mounts directly to 125 mm round ducts using standard clamps Any orientation: vertical, horizontal or angled Ideal downstream of fans, heat-recovery units or AHUs For enhanced noise control, install additional silencers in series at the inlet or outlet Technical Specifications Connection diameter: 125 mm Overall length: 600 mm Flange width (L1): 50 mm Casing material: Galvanised steel Acoustic fill thickness: 50 mm mineral wool Weight: 2.7 kg