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1. 6063-T5 primary aluminium profile; 

2. A new generation of hidden drainage design and solid type window (sealed and mothproof, and wind whistle prevention); 

3. Germany SI SIEGENIA Lvdun Zhongtian customized Great Wall Series hardware and Langsheng handle are configured 

4. The polyurethane polystyrene foam is poured into the heat insulation cavity, as a result, the thermal insulation property is greatly improved; 

5. The compound three-cavity design is adopted with strong rigidity and independent drainage system.