The Series 400 Air Purification System is a high efficiency carbon activated air filtration system for persons with upper respiratory disabilities. The heavy-duty Air Sentry is designed to control chemical and particle pollutants, including fine dust, pollens, molds, animal dander, bacteria, viruses, formaldehyde, ozone, cigarette smoke, odors, smog, and mildew. The cabinet has caster wheels allowing for easy maneuverability. The system works by sucking unfiltered air into a prefilter that traps larger contaminants. The air then passes into the High Efficiency Particle Air Cleaner (HEPA) where the air is scrubbed clean of particle contamination, trapping smoke, dust, fungi and bacteria. The cleaned air then passes into the chemical control unit where thousands of different irritating gases become neutralized. Finally, the clean air passes through one last coarse particle filter and is guided back into the environment. The optimum recommended room size for the Series 400 is 20 x 20 x 8 feet. POWER: 120 Volts 50/60 Herz. DIMENSIONS (HxWxD): 32 x 13.5 x 13.5 inches. WEIGHT: 55 pounds. COLOR: Creme beige. WARRANTY/GUARANTEE: One year limited warranty on air filter materials and workmanship. If dissatisfied with product notify company within 30 days of purchase for a refund of the purchase price excluding a 10 percent restocking charge and shipping charges.