With the VDL adjustable TROX swirl diffusers, the blade position can be altered (horizontal, angled or vertical air discharge) to give optimum penetration into the occupied zone when cooling or heating, at the same time meeting good comfort criteria. With high air handling capacity, the swirl diffuser is suitable for use in industrial and comfort conditioning environments. The diffuser can be used with large floor to ceiling heights (e. g. factories, airport terminals, theatres, banking halls) also in lower ceiling applications to 3.80 m (e. g. assembly rooms).