The linear and plain design of the wall-flush frame models for doors and glazing is one of Küffner’s hallmarks. Defined edge radii with a radius of only 0.5 mm, as well as the unmistakable visual appeal from anodised or else powder-coated surfaces can only be generated with extruded aluminium. The high-quality surfaces and outstanding workmanship, together with a well-thought through fastening technology ensures a durable tolerance of the overall construction, which fulfils the claim of sustainability. The well-thought out system of basic frames with aluminium plastering or dry wall construction edge profile facilitates a practicable mounting through the production of a precise wall opening prior to the completion of the wall surfaces. The clamshell aluminium frames are mounted right at the end after the rendering, plasterers and painters and flooring, together with the wooden or glass door leaves.