This component is suitable for an 8-centimeter fan.

I bought an exhaust fan on Taobao, but the other side wasn't suitable for my window, so I made this one instead.

The screws used are the 5mm screws provided by Taobao. The original ones are as shown in the picture

Here's what I did. The square opening isn't in the middle, but it's tilted to one side, so that a small opening can be made for the window

The effect of connecting the windows