200-900-50 round silencer NRF (50mm insulation), ETS NORD

The ETS NORD NRF 200-900-50 is a compact, high-efficiency round silencer for 200 mm ventilation ducts. Built with 50 mm mineral wool insulation, a perforated galvanised steel inner tube, and a protective fabric liner, it offers long-lasting performance and superior sound attenuation.
Complying with airtightness class D, this silencer is fitted with a factory-installed rubber gasket to prevent air leakage and reduce pressure loss, enhancing overall system performance. It’s ideal for residential, office, and commercial HVAC installations where noise control is essential.
The 900 mm length provides excellent attenuation while maintaining low airflow resistance. For even greater noise reduction, multiple silencers can be installed in sequence. Installation is quick and straightforward, with no sealants or adhesives required.

Technical Information:
Connection diameter (d) Ø (mm): 200
Diameter “d1” (mm): 300
Length “L” (mm): 900
Insulation thickness (mm): 50
Weight (kg): 10.9
Fire resistance class: EI15, EI60
Material: Galvanised steel sheet, mineral wool, protective fabric liner

For greater noise reduction, multiple silencers can be installed in series.
The most effective noise reduction is achieved when the silencer is installed directly behind the fan or a duct elbow.