Curved blade square ceiling diffusers carry out the function of supplying the air from the ventilation ducts to ambiances such as office, shopping center, conference room and extracting the polluted air from these ambiances. They are directly mounted onto the duct or plenum box. They are suitable for ceiling applications with heights of 2,6 mt - 4 mt. They provide horizontal air throw due to their fixed and curved blade structures. 1, 2, 3 and 4 ways supply can be made due to the arrangement of the blades.