The Phoenix Restoration Equipment Guardian R500 HEPA Air Scrubber is one of the most compact, lightweight, stackable (up to 4 units high) and portable air scrubbers on the market. Its 2-stage HEPA filtration removes 99.97% of air particles down to 0.03 microns, providing 4 air changes per hour (the recommended minimum) on 7,500 cu. ft. (more than a 30ft. x 30ft. x 8ft. room). HEPA filtration also offers optional carbon/potassium permanganate blend filter capacity. This unit features variable-speed flow, multiple ducting options for intake and exhaust, and a tough, rugged, roto-mold cabinet. Duplex GFCI and circuit breaker are onboard. The large horizontal inlet maximizes the capture zone. 30% more filter media maximizes filter life (up to 50% longer). Operates on 2.4 amps on high (500 CFM).