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

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.

If aesthetics and noise levels are important to you, Coway ProX for the main living space (assuming it’s large-ish) and any Coway “medium spaces” unit (use their website to filter) for the Bedroom. Total ~$1k. If aesthetics and noise levels are not important, two AirFanta 3Pro, run on Medium-High, about $400. If aesthetics are not important but noise is, four AirFanta 3Pro, run on Low or Medium-Low, about $800. If your budget is a little flexible and you want the highest CADR with the smallest footprint and lowest noise, a SMART AIR BLAST - MKII for the main living space (about $1,100) and any Coway “medium spaces” unit. Total, about $1,500.

FWIW, I have bad environmental allergies to chemicals and smoke, both of which block my nasal passages and result in sinus infections. For years, the air filter I used was the IQ Air HealthPro Plus, which is modestly effective. More recently, I bought a Coway Airmega ProX, which seems to be more effective for me. It’s a big filter that is made for large spaces and it filters smoke and VOCs with a carbon filter. On the high setting, it filters the air in a 1,000 square foot room 4 times per hour. In your bedroom, which is small, it would take less time to filter the air. Others are right in telling you to escalate your complaint or move out. But I just figured I would chime in to say that Amazon has a 30-day return policy, so if you want to test out an air purifier like the Coway, you can likely return it and get your money back.

I have the Winix C909 and Coway Pro X. Yes they are completely in terms of size and need, but they both feel like nice quality to me. I use each in the appropriate size room and it feels the same to me 🤷🏻‍♂️. Only bought both when they were on sale though. I personally think Coway is only worth it on a good sale

I have tried a few over the years and the ones that actually made a noticeable difference for me were the bigger HEPA units with high airflow. Coway has been the most consistent in my house. Once I sized it properly for the room, dust dropped and the air felt lighter within a few days.