OUTDOOR PROTECTIVE GRILL: One of the possible elements of the outlet end point of the ventilation system (e.g. ventilation fan, hood, etc.). The protective grid with low pressure loss and free of moving elements provides rain protection and protection against physical impact, it can be installed on both vertical and horizontal surfaces. The protective grill does not have a pipe socket, so it can basically be fitted to rigid-wall ventilation pipes that are led out to the plane of the outdoor surface. It can be used: at the end of ventilation systems made with 200 mm diameter or 220 x 90 mm rectangular duct elements, placed on the external side wall.