Suitable for use as a floorlight or rooflight. Double glazed derivative of construction type R165/75, also available as an in situ construction with maximum clear spans up tp 1470mm when installed as a floorlight for pedestrian loadings of 5KN/M². Contains 127 x 127mm double glazed lens units set into reinforced concrete ribs which are spaced at 165mm centres with an overall panel thickness of 75mm. Weight – 161 kg/m². In the interest of safety we recommend that when used as a floorlight, the glass lenses are sandblasted to the top surface to increase slip resistance.