Material: Galvanized steel sheet.

Specification: Matches the duct dimensions.

Structure: The inner wall of the sound attenuation chamber is a double-layer micro-perforated plate (without any fibrous sound-absorbing materials).

Features: The diameter of the perforated plate on the inner wall of the sound attenuation chamber is 1mm, with a perforation rate of 3%.

Sound attenuation: 12dB(A); Pressure loss: 20Pa (air velocity 6m/s).