DucoGrille Solid 30Z DucoGrille Solid 30Z louvre blades offer high ventilation capacity with relatively small louvre blades. The ‘stackable’ louvre blades form a single screen, making them extra strong and vandal-proof. The louvre blades are available with small punching (P1), large punching (P2) or as false louvres (NP) and provide a uniform façade design when combined in a single project. DucoGrille Solid 30Z grilles comply with the BS6180 standard (class X or XI) for fall-through protection (except MR30Z and Solid ISO)