Quiet and compact air purification system changes the air up to six times per hour.99.97% effective.Reduces common household odors, including pet odors, up to 30% better than other leading brands.Clean Air Delivery Rates of 101 smoke, 120 dust, and 120 pollen.With separate carbon pre-filter, ionizer, and three speed fan.Filter change reminders.Portable, compact design is ideal for floor or bookshelf use.How the HEPAtech System WorksWhisper-Quiet Hunter Fan draws air into the unit without the noise associated with many competitive models.Advanced Activated Carbon Pre-Filter reduces cooking, tobacco, and pet odors at least 30% better than competitive models.