40-717 is a part of the VELUX Sealed Unit GGLFS product line, which consists of a single-glazed skylight designed for flat-roof installation. The 40-717 unit measures 785mm x 585mm and is ENERGY STAR certified for its excellent thermal performance. It is designed to provide maximum daylight illumination and ventilation and is fitted with an insulated glass unit with an overall thickness of 24mm. The gasketed frame ensures an airtight seal, creating an energy-efficient solution for residential roofing projects. It also features an easy-to-operate, manual opening system. Additionally, it comes with a 10-year limited product warranty.