If it is made, it is not difficult. You can use paper shells or iron sheets.

The specific steps are not easy to explain. In short, it is to make a square hole in the window and then use this "wind bucket" to block the hole in the window. However, it should be noted that it is not a strict shelter, but a positive welcome, which requires it to be ventilated.

There seems to be no ready-made one. You can go to the rural market, or you can find an older blacksmith to make one.