1. Profile: the nominal wall thickness of the main force-bearing part is 1.8mm; 2. Hardware: standard Sobinco anti-theft concealed hinges open and inverted hardware; 3. Adhesive strip: The design of three sealing strips and the multi-cavity design of European standard make the heat preservation performance more excellent; 4. Glue injection: optional infusion of new filling materials, greatly improving thermal insulation performance; 5. Advantages: adopt extremely narrow design with flush frame and fan; 6. Optional configuration: optional built-in electric/manual shutter glass.