The underlying technology is based on an extruded aluminium profile that is fully integrated in the wall. All that can be seen is the rabbet, and only then when the door is open. The lock system is built into the profile.
The door hinges are completely concealed. The support profiles are fitted to a wood-based panel that is also used to attach the frame to the brickwork or studwork.
A gypsum-bonded fibre panel serves as a plaster base. The aluminium profiles are available anodised or primed for painting on site.