YIOU H13 Air Purifier Large Room

I own three other brands of HEPA air purifiers and this is my favorite. First, this purifier moves a lot of air... at all speeds. The squirrel cage design is quiet and efficient. The double filter design minimizes flow resistance and maximizes filter area. The night mode is nearly silent. (I wouldn't put it next to my pillow at night, but across the room it is barely audible.) The low speed mode is good for quiet daytime running and at that speed it circulates a lot of air. Medium and high modes get noisy but not in an annoying way. We only use high speed when cooking. The charcoal filters are very effective in reducing odors. The energy consumption is: 3, 8, 16, 24 watts for night, low, medium and high speeds.