Review Content I Bought the Right Unit! I have the 9500 Unit. Have had it for 2 years now, and LOVE it. I found these replacement filters at such an excellent price, I bought 2. Silly me! I didnt check the size. They fit the 9300 Unit. Rather than send them back, I bought the 9300 Unit they belong to! I love both units. I have the 9500 in my bedroom, and the 9300 in my front room. They are quiet, efficient, and FANTASTIC! I have severe allergies.....and a dog. LOL! So these units make my life so much better. Good thing is, now I know where to get the 9300 replacement filters for a GREAT price! Bought 4 months ago The filter was still clean 4 months after I bought it. Dont know if mom is using it enough. works great!!! for living area Excellent product Great filter if you have pets & I highly recommend it. I was worried about the sound at night but you get used to it quicker than I expected.