The Rehau System 2150 sliding patio door has a structural NAFS rating up to LC-PG45 and is designed to achieve an impact rating up to DP50 at 96 inches by 96 inches. The door allows for the creation of X-O, O-X, O-X-O, and O-XX-O configurations; an optional integral J-channel frame is available for new construction. Accessory grooves on the frame accept profiles such as jamb extensions and drywall returns. According to the maker, units with an overall U-value down to 0.20 are available. Contact distributors for pricing. na.rehau.com