New - Opened box to inspect. The Honeywell AllergenPlus HEPA Air Purifier is designed to provide cleaner and fresher air in medium-sized rooms up to 155 square feet. With its HEPA filtration system, this air purifier can capture up to 99.97% of microscopic airborne allergens and particles, helping to reduce the presence of dust, pollen, pet dander, and smoke in your home. Improve the air quality in your living space with the Honeywell AllergenPlus HEPA Air Purifier.