Lift and Slide door system provides superior thermal insulation, compared to standard sliding doors. Standard central sash section of 4 21⁄64" (110mm) and the minimalist alternative of only 1 31⁄32 inch (50mm). Large maximum sash dimensions make this system ideal for enclosing large areas, letting in more natural light. Aluminum framing while highly durable, yet light enough for an easy and ultra smooth operation on a reinforced stainless steel rail.