An air handler, or air handling unit (often abbreviated to AHU), is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. An air handler is usually a large metal box containing a blower, heating or cooling elements, filter racks or chambers, sound attenuators, and dampers.

China Electronics System Engineering No.2 Construction Co.,Ltd.

China Electronics System Engineering No. 2 Construction Co.,Ltd (CESE2) was established in 1953 by China Electronics System Engineering Co.,Ltd (CESEC) as a big state-owned technology enterprise. CESE2 provides full range of professional contracting and general contracting services such as clean environmental protection, intelligent facility system resolve scheme, engineering consulting, project management, equipment procurement, construction and installation as well as operation and maintenance of facility. Its service areas cover integrated circuits, flat panel displays, food, pharmacy, national defense, health care, new energy, machinery manufacturing and civil & industry building construction. CESE2 is the first enterprise to obtain Lu Ban Award, which is the highest ranking prize for clean industry in China.

Under the leadership of its parent company and the strong support from the community, CESE2 will always fulfill its societal obligations and maintain constant improvement to enhance its core competitiveness. With many years of efforts, currently CESE2 is a leader in the field of clean engineering in China. It has set up 30 branches, as well as 4 subsidiary companies. Constant improvement at CESE2 is key to its ability to expand into all industry supply chains.

CESE2 has 60 years of experiences and history, and has participated in many key national construction projects. With high quality and firm belief in pursuit of excellence, CESE2 has won many national and provincial awards. Such as the Luban Prize, thee silver prize, the China Electronics Technology Innovation Award, the "China Installation Star". Also, it has been repeatedly rated as an excellent construction and installation enterprise in China, top 100 enterprises in Jiangsu Province, the best installation company in Jiangsu and Jiangsu high-tech enterprise, etc.

CESE2 understands that being competitive leads to more opportunities, and continues being a leader and gains more opportunities, so as to maintain its constant innovation. The company aims to be an international service provider of industrial construction and environmental engineering systems.