01Thermal-break doors support a more comfortable envelope
The Shangmei 88 uses a thermal barrier within the aluminium profile to reduce direct heat transfer. Paired with suitable glass and seals, it helps the operable doorway perform more like part of the insulated building envelope.
02Outward opening preserves useful space inside
The casement leaf opens away from the room, keeping furniture and circulation clear. Its perimeter closing action also supports consistent contact with the seals; final weather performance depends on the selected size, hardware and installation.
03A heavy-duty slider carries the broad opening
The Xining L6 is reserved for the larger transition to the exterior, where panel weight and wind pressure place greater demands on the frame and running gear. The exact configuration is engineered to the opening rather than chosen by appearance alone.