Material: Galvanized steel sheet.

Specification: Matches duct size

Structure: The inner wall of silencing chamber is filled with 50mm thick centrifugal glass wool, covered with glass cloth and perforated plate with 5mm aperture.

Features: Silencing layer thickness: 50mm.

Sound attenuation: 12dB(A); Pressure loss: 15Pa (air velocity 6m/s).