What is the reason why the electric sliding arm window opener opens one outside and the other inside?

The reason why the electric sliding arm window opener opens one outside and one inside is because the windows are installed in different ways. Windows can be divided into two types: inner windows and outer windows. There are some differences between these two types of windows in installation and use:

1. Inner window: Inner window means that the window is open indoors. This kind of window will not occupy outdoor space when it is opened, and it is suitable for the situation where there are obstacles or limited space outside the window. The advantage of the inner window is that it is easy to clean and maintain, but the disadvantage is that opening it will occupy indoor space.

2. Opening the window to the outside: Opening the window to the outside means opening the window to the outside. After the window is opened, the indoor air can be circulated without occupying the indoor space. The advantage of external window is good air circulation, but the disadvantage is that opening it will occupy outdoor space and it is difficult to clean and maintain.