- Internal opening window performance
- The frame stacking position edge frame enhances waterproofing
- Glass groove depth 22mm
- Multi-chamber reinforcing piece (improves stability of large glass)
- Full closed edge band (improves stability of large glass)
- Full sealing cavity (improves sealing performance)
- Vertical isothermal of insulation strip
- Thickened treatment at screw connection points (further strengthens connection)
- Interlocking insulation strip structure
- Double internal opening window with 5 sealing strips
- Multiple sealing strips enhance overall performance
- Combination of inclined and straight pressure lines















