PRODUCT FEATURES: The overall design of the unit is mainly based on the "national standard of combined air conditioning unit standard ", referring to the technical data of similar products at home and abroad, to achieve the best design level and quality in the whole machine performance (air volume, cooling capacity, heat, wind resistance, noise) energy consumption, weight, volume, cost and so on. The unit is made of components, assembled in the field, the skeleton is made of high-quality plate cold bending, the groove frame assembly structure, the plate surface is filled with polystyrene foam or polyurethane high-quality light heat insulation sandwich board, the panel and the skeleton have joint parts are glued to self-adhesive sealing strip. The whole structure is novel and unique, light weight, good sealing and heat preservation, convenient loading and unloading, transportation and short construction period. The unit is equipped with new return air mixing section and filter section, new return air mixing section, primary effect filter section, average flow section, silencing section, fan air supply section and other functional sections, which can be used flexibly by design institute and users.