TheHealthPro Plus Air Purifier is the #1 rated residential air purifier for allergies and asthma on the market today. Key features include better-than-HEPA allergen filtration, powerful gas and odor filtration, superior efficiency, sophisticated controls, and ultra-quiet operation. Awarded with scores of industry best buy honors, this air purifier helps you create your cleanest indoor environment yet. This model is part of theNew Edition HealthPro Series Air Purifiers, which deliver more clean air, have a longer filter life, and are considerably quieter than previous models.?