The purifier ships as a flat-pack kit

Opening the box, unveils its contents that are carefully designed for transportation hazards. Inside you will find a a plastic bottom plate, four filters H11 HEPA, and a pre-assembled fan+lid module.

There is also a printed manual, a AC/DC adaptera and a velcro strap.

There bottom plate, includes the product ID label

There are inside four H11 HEPA filters.

and the top plastic panel with pre-installed four 140mm fans. There is also a fan regulator for adjusting the stock fan speeds.

There is no indication about the product RPM or manufacturer of the 140mm fans. Alternative you can change all four fans in case you need it.