Build to withstand A.S. 1562.3 (Droping 25KGs from 2.5 Meters the centre of the skylight). All polycarbonate construction. Gives complete protection against hail damage. Prevents persons on roof falling through skylights. Lowest fire rating of all glazing plastics. Dust and pollen filters can be fitted if required. Metal frames and flashings with acrylic or P.C. domes are available for corrugated roofs.