Muffler can hinder sound and let air flow through the main device, controlling air dynamic noise. I produced the muffler series is suitable for boiler steam, heating furnace, oven starts piping exhaust venting muffler, and applies to other gases (such as air, saturated steam, superheated steam, nitrogen, oxygen and the excess gas air compressor, fan, etc), the discharge muffler. Products by the majority of users use, noise effects, noise volume up to 30D b (a) above, in full compliance with national hygiene standards of the industrial enterprise noise.