1. Retro style, new Chinese classic;

2. The frame fans are flush with each other, and the injection angles are connected;

3. The lattice can be internal or external;

4. Three cavities with bridge-cut with expansibility;

5. Triple seal, airtight watertight sound insulation is good

6. Standard C slot with high hardware adaptability;

7. Optional inside opening, inside opening inverted or outside window;

8. Optionally integrated with window screen