[High Efficiency Air Purifiers] Breathe in fresh air with our large room air purifiers that cover an area up to 1730 sq.ft in just 1 hour. Our air purifiers refresh the air 5x per hour, and feature a powerful 3-stage filtration system consisting of a pre-filter, HEPA filter, and activated carbon filter. [3-Fan Speed Air Purifiers] This air purifier offers three levels of air flow intensity for you to choose from - low, medium, and high - based on your air quality needs. Not sure which level to choose? Our Auto Mode feature can automatically adjust fan speed based on real-time air quality measurements. Experience the difference with our top-of-the-line air purifiers.