• Sound-insulated telesopic duct – reduces traffic noise
  • Disc valve with cord – 3 opening settings
  • Cover with anti-condensation insulation – reduced condensation at low temperatures
  • For wall thicknesses between 25 and 40 cm – the tube can easily be sawn off


Sound reduction

The unit attenuates sound by approx. 25 % as compared to a register without insulation. Tested at the Jydsk Institute of Technology, Arhus, Denmark. A test report is available on request.

Sound Reduction Table
Closed 45 dB
Setting n° 1 28 dB
Setting n° 2 27 dB
Setting n° 3 26 dB