Based on 7 r/BuyItForLife mentions

Pure 511i Max Air Purifier

$139.99

Blueair

Keep your home a safe haven with the Blue Pure 511i Max, featuring advanced air purification that’s quiet enough for nap time yet powerful enough for allergy season. Quickly cleans 237 ft² in 12.5 minutes, 569 ft² in 30 minutes, & 1,138 ft² in 1 hour. Automatically detects & quickly removes pollutants such as viruses, bacteria, dust, and odors. Compact with 360-degree air intake, so you can place it anywhere-on the floor or table. RealTrack Technology accurately tracks filter lifetime based on usage and pollutant levels.

Reddit mentions

  • “I still like the Coway AirMega 200M (same as the AP-1512HH). It’s not the quietest at higher speeds, and it’s not tiny, but it moves the air and filters very well. There’s a reason…”
  • “Yes air purifier is very well worth it, especially if you can [get a good air purifier](https://www.reddit.com/r/homeowners/comments/1oneci4/the_best_air_purifier_for_home_to_buy_n…”
  • “I have a BlueAir 211i max and I'm very happy with it. It's great with dust and pet dander and also excellent for smoke—I live in an area often affected by wild fires.”
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Product details
Brand
Blueair
HEPA Filter
Yes
Finish
Blue
Assistant Support
Amazon Alexa