Diffusers are used on both all-air and air-water HVAC systems, as part of room air distribution subsystems, and serve several purposes such as:
- To deliver both conditioning and ventilating air
- Evenly distribute the flow of air, in the desired directions
- To enhance mixing of room air into the primary air being discharged
- To create low-velocity air movement in the occupied portion of room
- Accomplish the above while producing the minimum amount of noise
