Amaircare 2500, A UL Listed and CSA Approved HEPA Air Filter This Amaircaire HEPA portable air cleaner uses HEPA filtration as part of a three stage air filter system. The three stage air filtration includes a pre-filter, a HEPA filter and a post filter. Sturdy 24 gauge cold rolled steel case powder coated baked enamel finish in black . Variable speed German motor with 5 year warranty. Reduce dust, pollen and other allergens in medium sized rooms. HEPA is a filtration standard established by the U. S. Atomic Energy Commission. Americair manufactures its own Amaircare(R) brand HEPA filters. Filament is bonded to air filter media for structural support and even pleat spacing. After pleating, filters are enclosed in protective screens and cast in food-grade plastisol at both ends for a 100% air seal. Each Amaircare HEPA filter is then tested for 99.97% efficiency, with a laser particle counter. Amaircare Model 2500 HEPA Air Filter Specifications: German motors for durability and long life. Dimensions: 13.5″ H x 16″ W Weight: 15 pounds (Shipping weight – 19 lbs.) Variable speed operation: 50 to 175 cfm air flow Power Consumption: 41 to 84 watts (120V, 60Hz) (230V, 50/60 Hz also available) Coverage area: 300 to 650 sq. ft. (Based on 2-4 air exchanges per hour.) Warranty: 5 year by Amaircare Note: Item is returnable only for replacement if defective due to mechanical issues.