WinixGenuine 114290 Replacement Filter F for U450 Air Purifier, Black

This filter cartridge is rather expensive in my opinion for something you need to replace once a year, but it is still worth the price, since it works so well. Just make certain you are ordering the correct part number for your machine. That part number should be on a sticker inside the front cover of your Winix machine near where the filter is inserted. This is an all-in-one filter, which means the activated charcoal and HEPA materials are enclosed in one cartridge.

Been buying these each year for awhile now. I have two U450s in a 1000 sq ft house. "Washable" is sort of a misnomer. Just vacuum the prefilter periodically and change the whole cartridge once a year. People wreck their filters getting them wet, even though you're supposed to be able to. In the past they were cheaper through Winix with a coupon, but this time around Amazon was the way to go.I tend to think these will last longer in pet-free, not-too-humid households... I do more like 18-month intervals due to the expense.

Pricey. But the real replacement for the Winx. It is an excellent filter. My husband and I are allergic to cats. But have many. We foster and rescue. And this filter has really helped tremendously. Would give it 5 stars. But it's so expensive. Seems really high.

This is the real deal that's made for winix. It fits perfectly...no worries trying to figure out how to make a generic filter fit. These air cleaners seem to work well too. We like it and I vacuum the filters between 1 to 3 months...depending on how much we use it. There's so much junk in the air that we need to run it pretty often.

Don't get me wrong, I love my Winix U450 Air Purifier, and the replacement cartridge works great. However, I hate that they make you throw away the screen pre-filter and injection-molded casing by making you purchase the entire cartridge assembly. It really is trivial to replace just the charcoal and HEPA filters, so why is Winix gouging us by making us replace the casing and screen when it is totally unnecessary, and also adds the screen filter and the casing to the landfill? I don't even care that much about the charcoal filter, and would just like to purchase the HEPA filters by themselves. Many other air purifier systems have much less expensive replacement filters.This angered me so much that I spent a few hours trying to find another HEPA filter that I could fit into my U450, even if I had to block off some of the airflow. I did find one made by Homdox that fit perfectly width-wise, but was only a little over 2/3 the height. It was 1/3 the cost of this cartridge, so I just blocked off the top third with a piece of cardboard. I shouldn't have to resort to this, Winix! Just sell the HEPA and charcoal filters as a set!The most aggravating thing of all is that they DESIGNED THE CHARCOAL AND HEPA FILTERS TO BE INDIVIDUALLY REPLACED! Both have a tab on one end of the filter so that you can easily pull it out of the casing. If all we can ever do is replace the whole cartridge, WHY ARE THEY THERE???FYI, the U450 takes two HEPA filters that are 7 7/8 W X 18 1/2 H X 1 3/8 D. Also, there are many sites claiming to sell just the replacement HEPA and charcoal filter set for the U450/P450. The problem is, the U450 and P450 are completely different sizes, and the fit the P450 only.

I bought this for my U450 air filter unit and the fit was perfect for me. Had the filter 3 months now with no issues. I bought this when it was being sold by brookstone and fulfilled by Amazon so supply may have changed.

I don't know what's real or not with these things. We made the investment in our Winix and this is required to keep it up and running. The price is unacceptable. Otherwise, I think the machine and this filter do the job.

This Winix 114290 Air Filter is a direct replacement for my U450 Winix Air Purifier. Although the description says this filter is washable, instructions warn NOT to wash this filter as it will be damaged. I used a vacuum cleaner on my original filter once it was about 10 months old. I find this filter is good for a year. We love our unit since out house isn't centrally heated or cooled which means we have a lot more dust.