Technical reference: reverse swing (Reverse) diagrams, BK-33 concealed aluminum frames, KN-21 coplanar door units and architectural floor-to-ceiling door leaves up to 3000 mm high.
Traditional “Pull-side” Swing (OUT)
The classic option that swings out toward the hallway. On the hallway side the leaf sits flush with the wall, and concealed or surface-mounted hinges carry the leaf outward.
Reverse “Push-side” Swing (IN / Reverse)
The engineering standard for hallways and lobbies: the door opens into the room, yet on the hallway side the leaf stays flush with the wall — no steps or protrusions!
The BK-33 frame is made of high-strength anodized aluminum and is installed directly into the wall opening (12.5 mm drywall or plaster). After finishing, the frame becomes completely invisible — only a 3–4 mm micro-gap remains around the door leaf.
An engineered system in which the architrave and the door leaf sit in one flawless plane. Unlike standard doors, where the leaf is recessed 15–20 mm into the frame, the KN-21 coplanar unit creates a smooth architectural monolith.
A versatile telescopic frame and architrave system with a tongue-and-groove locking joint. It lets you finish a door opening of any depth quickly and neatly without finishing nails.
An architectural floor-to-ceiling solution: the top of the frame is hidden in the finished ceiling, creating the striking effect of a single monolithic partition.