See the precautions for purchasing doors and windows:

1. All doors and windows sashes are connected as a whole without screws.

2. Special steel linings are embedded in door and window frames and fan profiles.

3. upvcdoors and windows are all processed in the factory workshop with professional equipment, and cannot be made on the construction site.

4. The glass should be flat and installed firmly, and the installed glass should not directly touch the profile. upvcdoors and windows cannot use glass glue. If it is a double glass flat layer, there should be no dust and moisture in the interlayer.

5. The switch parts of pvc windows are closed tightly and the switch is flexible.

6. Sliding doors and windows can be opened and slid freely, with a soft sound and no dust falling off.