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2. Standard notch design, which improves the performance of the whole window, realizes flexible opening, convenient use and security anti-theft function; 

3. The large section design of the profile, the internal fan material adopts the integrated design, and the principle of equal pressure and decompression between the outer frame and the inner fan improves the airtightness of the door and window and the torque resistance of the profile itself , the drop hammer impact, etc. Ensure that doors and windows are not easy to crack in cold regions; 

4. The door frame adopts three-chamber design, strong rigidity and independent drainage cavity to ensure smooth drainage under any circumstances; 

5. The four corners of the sash are made of stainless steel corner reinforcement, and the 45 degree angle is more precise;