The Gutmann S70 SK pop-out window features a parallel opening mechanism that creates an open perimeter around the frame. Fresh air enters from the bottom, while stale air exits from the top to maximize natural ventilation. Its restricted opening width of 3 ⅛ inches helps prevent accidents, making it suitable for high-level floors while maintaining a seamless façade appearance. The window offers thermal and sound insulation, as well as high water-penetration resistance and low air infiltration.