WX type micro perforated muffler is a new broadband metal structure with silencer, galvanized by micro perforated plate assembly, due to the use of double orifice different perforation rate and different cavity, it has a wide range of audio in good effect. The muffler has the advantages of simple structure, no dust at work, no oil mist, water vapor and high temperature gas impact, and is widely used in air conditioning and ventilation ducts.