Structure characteristics: 1. undertaking various purification level of purification air-conditioning works to meet different environment different cleaning requirements of buildings under construction, to adapt to different customer needs. 2. participation in the design of clean air conditioning system and service system for the protection of the system as a whole and a wealth of experience. 3. cleaning the air quality: ventilation, ventilation, cleaning, exhaust indoor can be smelly, dust and cloud the hot air from the outside. While fresh outdoor air into the clean room, good air filter and cleaning levels are in line with the GMP (good manufacturing practices) requirements.