Three-dimensional surface mounted grille is used to protect the internal space of dampers from unauthorized physical and visual access, to prevent the possibility of external mechanical impact on the actuator of wall dampers and to decorate their appearance.

Features a more attractive appearance and the necessary structural rigidity; can serve as an element of architectural decor of industrial design style. In addition, the RON grille blades feature an internal bend, which signifi cantly reduces the possibility of their damage during installation and transportation. An additional feature of the RON grille is a lower air fl ow resistance and a slightly larger fl ow cross-section coeffi cient relative to its other grilles (louvered grille and R25 grille).