Fits perfectly and works very well. These things obviously do what they’re supposed to. This is our first time having to replace and it’s been over a year.

I bought this air purifier to replace a cheaply made, loud Holmes model that I bought from Walmart. To be fair, it did a decent job, but I wasn't impressed at all. So I ordered the Guardian because, I won't lie, I loved how it looked in the pictures and, more importantly, it had received universally great reviews. After using the Guardian for the past three days straight I can personally attest to the great reviews. This machine is quiet, works wonderfully, and is by far the most aesthetically pleasing air purifier I've ever seen. The only unfortunate thing I can say about it, and others have touched on this issue as well, is that there is a burning plastic smell that I noticed for the first several hours upon turning on the power. My room is medium sized, roughly 75-80 sq. feet (if I had to guess), and the smell was quite potent, especially for the first hour. I remember wondering if the thing would be kind enough to suck up its own smell, but the answer of course was no. Luckily, the smell soon faded and this purifier has been great ever since. I've read other complaints about the glowing blue light keeping people awake at night. I'm glad I'm stubborn and ignored these reviews, because those complaints almost kept me from buying the damn thing. I wouldn't say the light is exactly bright, more of a soft glow, but if you're sensitive to that sort of thing (as I very much am) you can simply turn off the U.V. while you sleep. It will continue to work amazingly without this feature running, although I do leave it on during the day while I'm at work. Does it actually do anything? I have no idea. Finally, I want to add that in NJ, where I live, this is currently prime allergy season, but when I wake up I feel completely neutral, as if the air outside weren't saturated with pollen (and God knows what else--it's NJ!). It's actually quite amazing. Pros: great for allergies, strong quiet suction, aesthetically pleasing beyond belief, will keep your space smelling nice, virtually no dust anywhere Cons: that damn smell for the first several hours Be back in a few months with an update!!