DER is a swirl diffuser which is mainly used in offices, hospitals and shops. It is installed in the range of 2.6 to 4.0 m above the floor and in the false ceiling or hung on the ceiling.
The DER diffuser has adjustable deflectors which changes the air distribution. The air flow range is in the range of 50 to 250 l/s
(175/900 m3/h). This type of diffuser is used for air distribution in the range of 10°C lesser than that of the environment.