The Concept Folding® 77 accordion door system combines high insulation and comfort with maximum transparency and aesthetics. This door opens your home to the natural surroundings while minimizing space requirements. It offers multiple opening options, both inward and outward. The CF 77 features a "working" door leaf, which functions as an entrance door when the rest of the structure is closed.

The CF 77 is available with three threshold options: high for improved insulation, low for improved accessibility, and a rising threshold. The CF 77 door is compatible with all CS window and door systems and facades.

The CF 77's visible external profile is available in two styles: Functional and Slim Line (CF 77-SL). The latter features a thinner, more aesthetically pleasing profile.