demgone

From what I know Smart Air changed the H11 to a H12 in the Sqair. The wedo air page is probably not updated yet. But I found interesting info in their article about HEPA filters. "Important to know: Before 2009, all filters were known as HEPA filters. But in 2009, the naming changed to EPA/HEPA/ULPA. Most people are more familiar with “HEPA 11” than “EPA 11.” That’s why many brands still refer to the HEPA terminology." The industry just changed terminology but the filters and their ability to capture fine dust remained the same. That's good to know.

I strongly disagree with half of your statement. Although air purifiers are simple machines, there's tons of rubbish available on Lazada. Especially those air purifiers costing between 500-1500 are usually complete garbage. There are a few tests that show that these machines are everything else but reliable. But other than that, indeed, air purifiers are not complicated tech. They are essentially just fans and filters. Smart Air and Xiaomi sell solid machines at good prices in Thailand. I am using both. I like Smart Air somewhat better as they are quieter and more sophisticated. But overall I am happy with both.