I don't use one but I subscribe to Consumer Reports. I see they have one at a fairly reasonable price ($250) that is rated quite highly (#3) - Honeywell HPA300 Air Purifier. The top rated one is the Blueair Classic 605 at $830, followed by the Blueair Blue Pure 211+ Air Purifier at $300. Those are the top 3.
If you have a particular one in mind I could look it up.
I use the Honeywell brand, they have different sizes depending on the room. I have two, purchased at the same time and I am happy with them. The Honeywell has a carbon prefilter that gets the larger dust particles and removes the bad smells out of the air. The second filter is a HEPA filter and gets the fine particles that are the real problem.
The carbon filter needs to be replaced quarterly, the HEPA filter yearly. The machine has an indicator on it letting you know when to replace the filters. I usually vacuum the prefilter a few times before replacing it. The replacement HEPA filters are expensive. All true HEPA filters are expensive. There is a combo package that sells the carbon filters and the HEPA filter together. With this you need to cut the prefilters to size. This isn't difficult but I would rather have pre-cut filters.
A friend of mine purchased a VERY expensive air purifier, but he has some lung issues, he wanted top of the line. I will ask him the name and get back to you.
EDIT: If you watch the video below he shows the expensive air purifier he purchased, a less expensive unit along with the air purifier he made.
You can always make your own. (This is my friend from the above comment) He has several air filters.
I made one of these filters as well.
That is a good idea IF you can't afford a honeywell type HEPA filter. Hepa filters alone remove 99.9% of airborne dust partials, The only thing I would add to that is a carbon filter as well for VOC's (volatile organic compounds). I also use a (surround air surroundair.com) purifier that uses ozone generator, it does remove odors very well along with the carbon filter it has.
I've read we breath in 2500 gallons of air per day. Wow! So if your sleeping with a cpap/ bypap or whatever, that is using the room air as a pressurized force into your lungs, and the air has contaminates other than 'dust', you could see how that would play into your overall health. It's a good investment. But if your one of those (the fan noise keeps me awake) kind of folks, find one with a quiet setting for sleep. Surround air is pretty quiet on the low setting.
Jeremy, My CPAP machine, AirSense 10, has a small air filter built in. It isn't HEPA but it helps reduce some garbage before it gets to the machine. I did notice that the filter on my last machine wasn't as dirty after I started using the Honeywell air filter. The reason why the prices have increased is supply and demand, with COVID more air filters are selling, prices go up. It is winter in the Northern Hemisphere as well, and when people are stuck in doors people worry more about air quality.
tallullahjo (I don't know if you have returned to the forums) An article about different air purifiers. I don't trust most "best of" articles on any item, there are many and each article produces different results. If there was any science behind the article there would be one or two devices across all articles that stand above the others. However, knowledge is power, getting as much information as possible is helpful. https://www.thegoodtrade.com/features/best-home-air-purifier
Not sure why this thread popped up as unread, but it reminds me of the Blocked Filter thread. There are replacement filters on Amazon that claim to be finer than the standard filter in the machine. Here is an example for the ResMed. These ones are not advertised as the fine ones, but I bought them and they are quite a bit finer than the standard ones that came with the machine.
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