Is it not well known by now that settlers and scammers do this on Amazon? They build up positive reviews with a different product and then change the product listing so it looks like the new item has loads of good reviews. This listing probably was for a dashcam when that user bought it.

i hate it when i order a dashcam and i get an air purifier

I just watched a Louis Rossman video about this (fake reviews), you should check it out.

The Joke aside, if this was genuinely your question the air is pulled in from the front and the clean air exits around the edges. I was looking for a wall mountable air purifier myself like a month ago and came across a few of these