The ESF55 is a sliding folding system that incorporates the high insulation characteristics of casement windows with the large and ease of use characteristics of sliding doors. This system can be used for openings where the viewing area is to be utilized with minimum obstruction possible. This system is designed to cater to the veranda doors and other similar requirements. The design guarantees performance and security with laminated safety glass, sentry glass, and cylinder lock compatibility. The outward opening orientation of this system allows you to utilize the area inside and get greater ventilation at the same time.