It consists out frame and inner swirl diffusing blades. This type of swirl diffuser is adapted to the HVAC system. Comparing the traditional spout, it can enhance the airflow supplying depth.
It is available to supply cold air horizontally, hot air vertically and normal temperature air in 45° angle. It is special for high floor in public, such as stadium, factory, airport, etc..
The blades can be easily moving by turning the central core to control the air volume.