According to the standard, broken bridge aluminum doors and windows the gap between the window frame and the sub-frame is generally 5mm, up, down, left and right. But sometimes we usually use two to three millimeters according to the actual situation. After locking the window, the two windows will not move or swing left and right.
Why do you need to add auxiliary frames to install doors and windows. The reasons are as follows:
1. Because the installation sub-frame is good for the installation firmness of the window, the protection of finished products, the insulation effect, the installation precision, etc. In the newly-built building, because the size of the door and window opening of the building is not very standard after being completed, after installing the auxiliary frame, the processing size of the door and window can be measured more accurately. The auxiliary frame plays a role in sizing and positioning doors and windows. Generally speaking, mega projects require the installation of auxiliary frames, which makes the standardization stronger.
2. Make up the gap between door & window profile and the wall, which is good for waterproof; Enhance the horizontal and vertical flatness of doors and windows; After the positioning and installation of the auxiliary frame, the size and position of doors and windows are determined, when dealing with the surface structure of the wall, the surface of the doors and windows will not be damaged or scratched, which plays a role in protecting the doors and windows.
3. It is also conducive to the installation of doors and windows and better operability. It is more conducive to the thermal insulation and sealing performance of doors and windows, especially the expansion phenomenon caused by thermal expansion and contraction of plastic steel doors and windows. Therefore, cracks occur at the edge of doors and windows, which not only affects its overall appearance, but also reduces the functional requirements of anti-seepage, energy saving and compression Deformation. Therefore, in advanced doors and windows, general design and steel auxiliary frame structure are used, it greatly improves the effective performance of doors and windows in these three aspects, and improves the comfortable degree of living environment.
