断桥铝门窗的副框叫附框、护框，按照材质它可以分为：钢副框、铝合金副框、木质副框等。
The auxiliary frame of the bridge aluminum window and window is called the frame, the frame, according to the material can be divided into: steel subframe, aluminum alloy side frame, wooden frame and so on.

 
门窗框在墙体上固定且用于安装门窗的框子，一般用于70系列及以下型材，如果窗户需要包窗套(窗户垭口)，窗户四周需要粘贴瓷砖，窗户顶部需要吊顶的情况，那么就需要增加附框，因为70系列及以下型材边框比较窄，对门窗的开启会有障碍。
Door window frame fixed on wall body and used to install the door window frame, generally used for 70 series and the following section, if the window need package window (pass) the window, the window need stickup ceramic tile, around the condole top of the window at the top of the need, you will need to increase the attached box, because 70 series and the following section frame is narrow, the doors and Windows open there will be obstacles.

 
安装副框的好处在于：门窗安装完两边会有缝隙，不太美观，而加上副框后可以把缝隙全部盖住，功能上相当于门窗的哑口，但是加副框是需要单独加收费用的。
Install deputy frame is that the benefits of Windows and doors installed on both sides will have crack, is not very beautiful, and combined with frame can cover all the gaps, after the function is equivalent to the dumb mouth of door window, but vice frame is need to separate cost extra.

 
1.现在基本上都会安装副框，因为安装副框对于窗的安装牢固程度、成品保护、保温效果、安装精度等都有好处。在新盖的楼房中，因为建筑房屋的门窗洞口建成后，尺寸不是很规范，安装副框后，就可以比较精确地测定门窗加工尺寸。副框对门窗起到一个定尺、定位的作用。一般来说，大型工程均要求安装副框，这样规范性就更强。
1. The secondary box will be installed now, because the installation of the secondary frame will be beneficial to the installation of the Windows, the protection of finished products, the insulation effect and the installation accuracy. In the newly built building, because the door and window of the building house is completed, the size is not very standard, after the installation of the auxiliary box, it can be more accurately determined the window and window processing dimensions. The secondary frame has a ruler and positioning effect on doors and Windows. Generally speaking, large projects require the installation of sub-boxes, which is more prescriptive.

 
2.弥补门窗型材与墙体间的缝隙，利于防水；增强门窗水平与垂直方向的平整度；副框定位、安装完毕后，则门窗尺寸和位置就确定了，在进行墙体表面结构的处理时，而不至于使门窗的表面有所损坏或擦伤，起到了保护门窗的作用。
2. Make up the gap between the window section and the wall, for the waterproof; The flatness of the door and window level and the vertical direction; Vice frame orientation, once installed, the window size and position is determined, on the wall surface of the structure of the processing, and not make the surface of the doors and Windows have damage or scratches, have played an important role in protection doors and Windows.

 
4.也有利于门窗的安装，操作性更好。更有利于门窗的保温和密封性能，特别是塑钢门窗因热胀冷缩而产生的伸缩现象。从而使门窗边缘产生裂缝，既影响其整体美观，又降低了防渗、节能、抗压变形的功能要求，所以在高级门窗中，通常设计和使用钢副框构造，大大提高了门窗在这三个方面的有效性能，提高居住环境的安全、舒适程度。
4. Also advantageous to the installation of doors and Windows, the operation is better. It is more advantageous to the insulation and sealing properties of doors and Windows, especially the expansion of plastic steel doors and doors due to thermal expansion and contraction. So that the door edge cracks, both affect the whole beautiful, lowers the seepage control, energy saving, the function of the compressive deformation, so in advanced doors and Windows, usually design and use of steel frame structure, greatly improving the doors and Windows in the three aspects of performance effectively, improve the degree of safe, comfortable living environment.