First, the product description Square diffuser is commonly used in the air conditioning system outlet, have uniform bulk flow characteristics and simple and beautiful appearance, can be made according to the requirements of a square or rectangle, can meet the requirements of any ceiling decoration. The core part of the diffuser can be detached from the frame, easy to install and clean. Can be equipped with rear air control valve to adjust the air volume control. Suitable for studio, hospitals, theaters, classrooms, concert halls, libraries, recreation hall, theater lounge, general offices, shops, hotels, restaurants, and gymnasium. To enable people to avoid interference noise and discomfort in a variety of environments, in addition to the neck press table to determine wind speed performance, but also need to consider the installation height and installation applications.