Doors and windows outside the door and the door and window hole size difference if only to the size of the hole how to install into the box size of the external problem added: in the end is minus a few centimeters ah? More
General box size is the size of the door and window openings height by 4 cm
In accordance with the national standard and local standard set, we are here 3 cm, if the size of the window is too small to reduce the size of the larger if it will be obvious, there is a little waste of blowing agent, The windows are not good to install, the hole standard is also better, if not the standard chisel wall even more trouble
In general, the size of the door and window openings larger than the size of the window frame, in the processing window frame when the size of the hole according to the size of the hole, the relationship between the two: window frame size = hole size - about 1 cm from top to bottom, for example, If the hole size is 2000 * 1800, then the window frame size is 1980 * 1780.
