Acoustic reducer for ventilation holes - Helix34

Helix34 is an acoustic reducer for ventilation holes of the perimeter walls and / or ventilation ducts Ø 125. The product, also available in a telescopic version, is a soundproofing module to be put inside an already existing Ø 125 pipe and it allows natural ventilation and noise reduction of 34 dB (certified with tests made in compliance with EN 20140-10 and ISO 717-1 European norms).