1943 sq. ft. Air Purifier in White with 360-Degree HEPA Filter, Air Quality Monitor, Timer for Large Rooms. Works perfect! Needs filter. $100 A unique 360 degree HEPA filter relieves allergies by capturing 99.97% of dust and allergens as small as 0.1 microns in size. A large activated carbon filter attacks common household odors including those caused by smoke, cooking and pets. And, it works to reduce the many VOC's that are emitted by common household products and cleaning chemicals. It includes an Air Quality Monitor that detects the amount of particles in the air and automatically adjusts the speed to optimize room air quality when in auto mode. An ionizer option is built into the unit and can be turned on to boost allergen control. The ionizer emits negative ions that attract microscopic allergens to form larger particles that can be easily trapped by the HEPA filter. The purifiers stands about 28.5 inches tall, has a timer up to 12 hours and a touch display with child lock. This powerful air purifier circulates the air 1x per hour in 1943 square foot rooms and 4.8x per hour in 402 sq. ft rooms, making it ideal for medium to large sized rooms such as: dorm rooms, bedrooms, and other living areas.