WINIX 5300-2 Air Purifier is also significantly better then the levoit since they have a higher cadr rating this or the 5500 model will be my next one I buy
To accurately understand what size you need for 7+ air changes per hour (ACH) you should [calculate the CADR of your room](https://housefresh.com/cadr-calculator/). Ideally a rate of 7 or more air changes per hour is really good but 5 is acceptable and really any clean airflow you get is better than none at all.
The comments might have good suggestions in theory but in practice your room may be sized wrong for the suggestions that have been provided to you. Keep in mind that lots of air purifiers advertise that they cover a very large square footage when that is usually measuring their highest setting at one change per hour (so, a bit loud for the entire time you are using it for that effectiveness level). A great thing to do to ensure you have proper coverage is to size up and get a model that has multiple fan speeds. For example, my Winix 5300 series has 4 fan speed settings and I use settings 3 & 4. If you are looking for a quieter option for a CR box there are ways to build them with PC fans which will give you a very quiet CR box that still delivers clean air (r/crboxes) Additionally, [clean air kits](https://www.cleanairkits.com/) does make prebuilt CR boxes but they are a bit expensive.
i have three of them and love them. they've been great.
although, on one of them, the fan is a bit noisy when it goes into sleep mode sometimes after six years of continuous operation. goes away if I move it. I probably can lubricate the bearing if I take it apart. I used turbo mode on that one a lot so that probably increased the wear.
The other two have been flawless.
Yep as far as air purifiers the more the merrier. Especially if you don't want to run them loud. My house currently has 2xc909 2x545 and 1x5300 our air quality is pretty good so the filter lasts but it's great for pollen and other things.
AnihilationXSX
