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Square diffuser has good dispersing characteristics and beautiful appearance, widely used in air conditioner, its structure is diverse, there are 1--4 different direction divergence form, can meet the requirements of all types of ceiling diffuser frame, and the inner core can be separated, easy disassembly, easy adjustment according to the requirement of air diffuser, the rear end can be matched miter gate (valve) to adjust the inlet air volume (OBD). The outer frame and inner core are made of high quality aluminum alloy profile, and treated by natural polarization, and the anodized film is solid and corrosion resistant. The current of the diffuser is attached (flat delivery). Widely used in hospitals, theatres, classrooms, concert halls, libraries, recreation halls, theatres, lounge, general offices, shops, hotels, restaurants and gymnasiums.