This is an air purifier designed with a RTX4090 fan, and the filter element used is from Xiaomi, which is a very cheap part, but it works very well ...

The purchase of RTX4090 and filter cartridges are from Taobao in China, and the price is about 20RMB+10RMB ($6), note that you need to choose a CCW fan when purchasing, otherwise it will not work normally.商品详情页 (taobao.com)

The design is thin, and the fan is completely embedded in the cabinet, which is not only low cost, but also takes storage into account. Of course, I am still constantly reinventing and refining this design, which may include the design of hardware circuits, so it will continue to be updated in the future (but I am not sure of the time), welcome to download, collect and comment.