An 800 sq. ft. room needs minimum CADRs of 534 CFM.
If the room is 600 sq. ft., min. CADRs should be 400 CFM.
The Coway Airmega ProX would absolutely be needed for the 800 sq. ft. space.
Something like the [Medify Air MA-112](https://medifyair.com/products/ma-112?variant=31240021180483) is cheaper, but it's loud on the highest airflow speed (sound power level of 68 dBA).
If you want just good or average quality, you could look into *two* [Winix C909 purifiers from Costco](https://www.costco.com/p/-/winix-c909-4-stage-air-purifier-with-wi-fi-plasmawave-technology/100842491).\* Top Smoke CADR is 323 CFM. It's somewhat loud on the highest airflow setting called "Turbo" (60 dBA according to the Decibel X Android app). Some Winix units develop bad motor bearings after the 2 year mark; this manifests as a whining, whirring, or clicking noise. The C909 has PlasmaWave, a bipolar ionizer. If birds will be in the house at any point, be sure to keep PlasmaWave *off* as it could harm them. (PlasmaWave is enabled by default after a power off/power on cycle.)
\*Currently out of stock; should be back somewhat soon.
I use a MedifyAir MA 112. I Run It on fan speed 2 and get about 6 months at a time out of the filters. I have a family of 4, 1 cat, and 1 dog and have seen a huge reduction in dust.
I have Medify MA-25. High-end HEPA filter. Bought 4 for work during COVID 6 years ago. Bought more for myself. At low and medium speed it is quiet so as not to bother kitty near litter box. Recommend pet version with charcoal for even better odor control. She also likes to sit in front of the much larger and noisier version in my living room. Maybe reminds her of outside wind when she was abandoned.
sissasassafrastic
