The replacement filter is perfect for our Hoover Air. It sits right where the old one was. The only thing I noticed was that there was no filter style sticker on the gray body around the filter. So if you get this one as a replacement, take a picture of which HEPA filter you need so you know when you need another replacement. When your vacuum cleaner lasts that long. guys, how long are you keeping them? I grew up pretty modest so I want to keep it going until it stops sucking. *ba dum tiss*. Oh, someone shoot me. I'm 31, no kids, and I'm sitting here joking with dad in a vacuum filter review.