1. frame and fan angle adopt isopiestic strip, double sealing strip, ensure the gas confined function, from the isopiestic room structurally and meanwhile drains water effectively according to isopiestic principle.

2. Accessories can be simply operated, directly located, and quickly installed.

3. Hardware has strong loading capacity, and can meet the maximum weight of the window 130kg.

4. Standard inward opening tilt & turn design, fulfill the inward opening tilt & turn function, high security.

5. Open-state monitoring and alarming devices and be installed for specially required windows and doors.

6. Adopt symmetrical structured three cavity profile system, heat insulation strip of profile separated into "I" and "T" type.

7. Specialized plastic injection channel is set up at angle joint to ensure that the internal and back of the angle joint is sealed effectively, and strengthen the angle.

8. Special angle steel sheet enhances the angle quality of the hanging arm of the frame and fan angle, and make the joint angle more even.

9. Treatment for profile surface: Anodic oxidation, electrophoretic painting, powder coating, fluoro-carbon painting.

10. For hardware: Germany Roto, Germany Siegenia, Hongkong Kinlong, Italian Glass.

11. For glass: 5mm+9a+5mm insulating, 5mm+12a+5mm insulating, 5mm+9a+5mm+9a+5mm double insulating function glass.

12. Different strengthening club can reach different level of anti-wind and pressure performance.

13. Different sound insulation performance of different glasses can reach 30dB, 35dB, 40dB.

14. Different heat insulation performance of different serial of profile and different glass can reach 2.8W/(m2k), 2.5 W/(m2k), 2.1 W/(m2k) or below 2.0 W/(m2k).