The basic revision of the adjustable swirl diffuser type VDL has been finalised. With its outer ring incorporating a discharge nozzle, the new VDL is optically more attractive and at the same time convincing in its aerodynamic function. The new generation diffusers are available with removable faces, facilitating subsequent installation of the diffuser face, simplified access and the exchange of the actuator inside. In addition, due to the large demand, an inexpensive, fixed construction is also available, as are variants with collar and protection grid. This leaflet will initially only be available in electronic form.