1. The sub-frame is beneficial to the installation degree of the window, the protection of the finished product, the insulation effect, and the installation accuracy. In the newly built building, because the size of the door and window opening of the building house is not very standardized, after installing the sub-frame, the size of the door and window can be measured more accurately. The sub-frame plays a role in positioning and positioning of the door and window.
2, to make up the gap between the door and window profiles and the wall, which is conducive to waterproof; enhance the horizontal and vertical flatness of the door and window; after the sub-frame is positioned and installed, the size and position of the door and window are determined, and the surface structure of the wall is processed. When it does not damage the surface of the door, it plays a role in protecting the doors and windows.
3, is conducive to the installation of doors and windows, making it more operability. It is more conducive to the insulation and sealing performance of doors and windows, especially the expansion and contraction phenomenon of plastic steel doors and windows due to thermal expansion and contraction, which causes gaps in the edges of doors and windows, and affects the appearance, and reduces the functions of anti-seepage, energy saving, compression and deformation resistance. . Therefore, when installing doors and windows, the sub-frames are usually designed and used, which greatly improves the effective performance of the doors and windows in these three aspects, and improves the safety and comfort of the living.
