Airmega ProX

Sorry, there's some misinformation here. Roughly speaking, purifier sizing depends on room volume, pollution concentrations, and CADRs (although IQAir does not list CADRs for most of its models). A lower airflow speed or setting means slower and/or possibly ineffective cleaning. This becomes more pronounced as room volume or pollution concentrations increase. The [IQAir HealthPro Plus XE](https://cdn.shopify.com/s/files/1/0065/4780/0182/files/HP_PLUS_B2C_Product_Overview_v01_2025.pdf) has a top "Nominal Flow Rate" of 300 CFM.* Unfortunately this is also a fairly loud unit. *Document says 300 m^(3)/h, but I think this is a misprint. See the tech specs for the older version of this model, the [IQAir HealthPro Plus NE](https://cdn.shopify.com/s/files/1/0065/4780/0182/files/Tech-Specs_HPP-NE_120V_120924.pdf). The Amazon screen capture is incorrect. The [HyperHEPA filter](https://www.iqair.com/us/products/replacement-filters/hyperhepa-h12-h13-f3) is not H14 class. IQAir lists it as "HyperHEPA H12/H13". But to be precise, there is no H12 filter class designation in the [EN 1822-1:2019 High efficiency air filters (EPA, HEPA and ULPA) - Part 1: Classification, performance testing, marking standard](https://www.airum.com/frontend/immagini/files/EN%201822-1.PDF). There is only E12, whose filter group is Efficient Particulate Air (EPA). The [HealthPro Plus 10 year warranty](https://www.iqair.com/us/support/iqair-warranty-coverage) applies if you register the purifier *and* maintain a filter subscription OR provide filters' proof of purchases. I think IQAir makes high quality units with tight manufacturing tolerances. But they're not as powerful as the Smart Air Blast MKII or Coway Airmega ProX.

Aren’t ionizers kind of bunk though? I’m happy with my coway prox fwiw - anyone thinking of buying

What really matters, is HEPA CADR at an acceptable indoor decibel level (40db or less). Energy consumption at that level also has secondary importance, as running it 24/7 will cost you a fair amount over the lifetime of the appliance. You need an oversized DC fan/blower (sound increases exponentially with fan tip speed), a high quality cabinet, and deep HEPA filters. Those pc fan + low MERV filter kits will do basically nothing. I think the Coway Pro X is the best large room filter, Levoit 600 best medium, Coway 150 best small. Coway also has stuff that competes in the medium range, but I think it’s overpriced. Remember that you won’t actually run the filter at the advertised CADR rate, because the noise will be excessive, so you have to base the actual CFM on the lowest 2 levels (usually). The only thing that gets used on an air filter is the motor (aside from the filters), so make sure it’s a fully sealed DC motor, and it should last a very long time.

Hi, what did you end up doing? I have the regular health pro plus from Iqair, and while it is good, I want more air exchanges per hour. I bought a Coway pro x to replace one of my health pro plus models last year and LOVE IT! I am thinking about buying another pro x since my iqair filters need to be replaced now and it’s $370 USD to replace all 3 layers. I was also thinking about the Allen 75i, which it sounds like you own and like (you mentioned the 75i is quiet, which is why I like the pro x so much). Have you made a final decision yet on which unit you are keeping? What are your thoughts?

I tried the Coway 400 which has 51 Db(a) and it was CRAZY loud. Immediately packed it up and returned it that same day. So I ended up getting another ProX since I know I love everything about it (you are right about the wheels not rolling on carpet, though). I wanted to try the alen 75i, but after trying so many purifiers in my life, I didn’t want to gamble and have to do another return. Plus, the prox still has more airflow compared to the 75i. I am keeping the 75i in mind for the future, though. It does sound like a great unit (has way more carbon than the proX) and you are confirming that the noise level is great. So I will definitely be keeping it in mind for another room in the future. Also, thanks for the heads up about the 45i. I’ll skip that one.

I have a coway 250 and a ProX I'm extremely happy with both. They have been solid for me. Very well made and I like how simple they are.

I've had them for a few months now. Really happy with them. My #1 thing I was looking for was reliability. I don't mind if filters are slightly more than other models. (Although there is 3rd party available) As long as I'm not having to waste time and money replacing a unit. Both are great and I love that I don't need to depend on an app to use all the features. The "smart" works well. I have one in the bedroom and the sleep mode is great. Very simple effective units.

I had a similar debate as you. I ended up getting a ProX. Consumables are expensive. But it has the perfect mix of simple and not too smart options. The smart air blast has lots of issues on reviews. The healthmate seems decent. But I haven't seen much about it. For me even with the consumables high. The prox has stellar reviews and are incredibly reliable. I'd rather spend a couple extra more bucks a year but not have to replace my unit sooner down the road. A brushless motor for me is a must.