Useful in a variety of buildings, the DEF ceiling swirl diffuser can either be installed in false ceiling or hung freely between 2.6 to 4 meters above the ground. For optimum performance, the air distribution temperature in the device must be around 10 °C lower than that of the atmosphere. The device produces an airflow range between 70-300 l/s (245/1070 m3/h). Adjusting the deflectors regulates the air distribution. Deflectors also come in black and are available upon request. This lighting device comes in three different sizes: DEF 1, DEF 2, and DEF 3.