If you've been researching air purifiers for a large space, the PuroAir 400 is worth a serious look. It covers up to 2,000 square feet — independently verified in an ISO certified lab — and cleans that entire space in about an hour. That's real coverage for open concept homes, not just a single room. The filtration is medical grade. The PuroAir 400 uses a HEPA 14 filter, which is ten times more effective than the standard HEPA filters most purifiers use. It captures particles down to 0.1 microns — that's dust, pollen, pet dander, mold spores, and wildfire smoke. There's also an activated carbon layer that handles odors and VOCs, so you're not just moving air around, you're actually cleaning it. The unit runs automatically. A built-in air quality sensor reads your room in real time and adjusts the fan speed based on what it detects. On low it runs at 35 decibels — that's barely audible. And it's certified by CARB, UL, ETL, and Energy Star, so the perfor...