Clean Air Kits

If you're talking about producing en-masse, the lasko box fan build is fast and easy, and you don't need whatever specialty piece of plastic/board that is showin in black in the photo. Similarly, you will lose some of that simplicity for time because you'll need to hook the fans up to the power supply, screw them and the grills into the board, etc etc. If production time and people-power is the pinch point, the box fan method is a faster build. Fewer steps, fewer materials, fewer tools. HOWEVER: Depending on the application, I'll echo what RescuePenguin said. I have some of the CleanAirKits purifiers running in my home at all times, and those use PC fans. I can barely hear them. The air purifier I have at work I keep on low most of the time because if it's running full speed the background noise makes a big difference in how well people can hear and talk in a mostly-quiet room. If I had a filter based around the 20 inch box fan, I'd probably have the impulse to switch it to low or off so I could hear and be heard better.

100% for smoke, dust and allergies. We use cleanairkits, best performance for the price

Cleanairkits is the most efficient and effective filter I have found

Not pretty but very effective  Corsi–Rosenthal Box - Wikipedia https://share.google/VT90TcVB763kaVmSa

They work very well. When covid hit i looked for a way to try and address aerosol transmission as someone who has never caught a light cold or had a touch of the flu in my life. If i get sick i get very sick. I put together 2 of these and bought a CO2 and a particulate air monitor and i was amazed at how dirty those filters would get in just a matter of months. After a while i bought filters that use PC fans because they are much, much quieter. I was lazy and bought them but if you are a little bit handy you can put them together yourself. [https://www.youtube.com/watch?v=wS0LK\_LiqmE](https://www.youtube.com/watch?v=wS0LK_LiqmE) The ones i bought come from here if you have the funds: [https://www.cleanairkits.com/](https://www.cleanairkits.com/)

Is it a bedroom? I would split the budget 50/50 and do a CleanAirKits CR box plus a Levoit or Coway “for mid-size rooms”.

Different sound signatures, so the cumulative noise shouldn’t be perceived as much. Different filter technologies/properties (MERV 13 vs HEPA H12 or H13), so different efficiencies at different particle sizes, though given enough time (air changes) they both would work about the same. It also gives you hands on experience with both so you can decide what to buy after that 😂

Yeah absolutely.  I don’t mind a little noise, but on some of these air purifiers to get the CADR that makes sense, you need to blast them.  I recently bought a PC fan air purifier from clean air kits. They t won’t win any beauty contests but it moves a tremendous amount of air with very little noise.