Non-adjustable aluminum grilles of the OZA-R50 type are intended for external decoration of the outlets of ventilation shafts, air ducts, openings, and, if necessary, for decorating the facade of premises.

The grilles can be equipped inside with a perforated metal mesh to prevent foreign objects from entering the protected area. The upper shelf of the OZA-R50 grille casing has a so-called "drip mold" to protect against precipitation entering the inner cavity of the grille.