公司名称：成都迈科新材料有限公司

Mechanical power noise: it refers to the low and medium-frequency noise caused by running, vibration, friction and collision of equipment.
　　Pneumatic power noise: it refers to the low, medium and high-frequency noise caused by high-pressure airflow, capacity expansion, tangential flow, exhaust steam, and air leakage in various sorts of fans, air ducts and steam tubes, among which the exhaust steam produces high-frequency noise and has remarkable influence on environment.