No. 9 doors and windows were born in Shenzhen, the world's innovation capital. It is a high-end door and window enterprise integrating research and development, production, sales, technology and service. With international vision and keen insight, No. 9 doors and windows have grasped the development trend of high-end doors and windows in the world, leading the vane of doors and windows industry for 14 years. It was established in 2009, but now there are reports on the website that there are some problems with the quality of this brand. It is said that some doors and windows are not made by the original manufacturer and processed directly in the local area, so the doors and windows are not labeled. Therefore, attention should be paid to the choice of doors and windows. At the same time, it is better to choose a larger brand, because it is more troublesome to replace doors and windows.
Of course, the following points should be paid attention to when choosing doors and windows:
First: the wall thickness of the profile should not be less than 1.5mm, and the heat insulation strip in the middle should be PA66 nylon instead of pvc, because the thermal expansion coefficient of PVC is too different from that of aluminum, and separation will occur after a long time, the width of the heat insulation strip should not be less than 2cm, and the heat insulation effect cannot be achieved without heat. The profile should have a drainage system,
Second: The glass should be energy-saving glass,
Third: hardware must be brand,
Fourth: The installation must be standardized. Otherwise, no matter how good the window is, the effect will be poor. Stare at the installation and construction personnel, fill the foaming agent and seal the sealant tightly.
