Diffusers are commonly used air outlets in air conditioning systems. They have uniform diffusing characteristics and a simple and beautiful appearance. They can be made into square or rectangular shapes according to the requirements of use, and can meet any ceiling decoration requirements. The inner core part of the diffuser can be detached from the outer frame for easy installation and cleaning. The rear can be equipped with a tuyere regulating valve to control and adjust the air volume. It is suitable for broadcasting studios, hospitals, theaters, classrooms, concert halls, libraries, amusement halls, theater lounges, general offices, shops, hotels, restaurants, and gymnasiums, etc. In order for people to avoid noise interference and discomfort in various environments, in addition to determining the neck wind speed according to the performance table, it is also necessary to consider the installation height and installation occasion.