Acoustic reducer for ventilation holes - Helix43

Helix43 is an acoustic reducer for ventilation holes of the perimeter walls and / or ventilation ducts Ø 160. The product is composed of a cylindrical casing with helical modules placed inside thus allowing the passage of natural air and the noise reduction of 43 dB (certified with tests made in compliance with EN 20140-10 and ISO 717-1 European norms).