The Joinery System is a heat insulated aluminum door and window system with a hidden sash opening feature with a frame depth of 67.1 mm. The sash frames are not visible from the outside and when the sash is open, the image does not change as it does not create a different profile width with other windows. It is resistant to high wind pressure with reinforced coil. 72.1 mm sash depth and 1.7/1.6/2 mm wall thickness profile options are available. 24 mm heat barrier and 24 mm maximum glass thickness. Normal opening, double axis and transom options are available.