Lift and slide patio door system was designed for oversized openings. It offers an effortless operation with a simple handle turn which lifts the door up and brings it in a sliding mode, and when the handle is returned to its original position, the door is lowered in a fixed position and air/watertight seal is engaged. Lift and slide patio door is a reliable system and an ENERGY STAR® qualified product which provides protection from the elements and enhanced security with a multi-point locking mechanism. Lift and slide door system has a mechanically assembled sturdy vinyl frame, its sashes are welded and reinforced for superior rigidity. Double weather stripping is placed around perimeter (quadrupled at sash corners), glass panels are double sealed (can also be triple sealed), filled with Argon and coated with Low-E. The door has smooth and glossy surfaces for refined aesthetics and minimal maintenance. You can enjoy panoramic views and maximized comfort with this high quality product which meets the most demanding industry standards.