Ideal for generating some of the freshest, cleanest air this Bedroom Machine Air Purifier has a 5-stage filter composed of a medical-grade HEPA, HEGA carbon cloth and an anthracite carbon-zeolite blend. Perfect for spaces up to 1, 500 square feet, The Bedroom Machines 360-degree intake system draws air into all sides of the unit making sure it purifies your air completely. Endorsed by the National Sleep Foundation, the Austin Air Bedroom Machine air filtration system is designed to meet Johns Hopkins University Medical School specifications for capturing nano gases and particles. Operating the Bedroom Machine is as easy as using the control knob to select from three speeds. And with a filter designed to last five years, the Bedroom Machine is a low-maintenance unit. Stage 1: Large-particle pre-filter removes visible particles, such as dust, hair and pet dander. Stage 2: Medium-particle pre-filter removes mold, pollen and other allergens. Stage 3: Fifteen pounds of anthracite carbon and zeolite remove odors, chemicals and gasses. Stage 4: Sixty square feet of medical-grade HEPA removes microorganisms, such as viruses and bacteria, and any other particles larger than 0. 3 microns. Stage 5: High efficiency gas absorption cloth further removes sub-micron particles, gasses and chemicals. Material: MetalColor options: Black, beige, dark blue, whiteFiltration Type: HEPA FilterProduct Features: Recommended Room Size: Large, 401 or moreDimensions: 14. 5 inches x 14. 5 inches x 23 inches