HEPA Negative Air Machine Variable Speed Thermally Protected Motor HP 1/2 Voltage 115 5.8 Amps Height 21 In. Length 32 In. Width 18 In. Air Flow with HEPA Filter 300 to 950 cfm Air Flow without HEPA Filter 250 to 1500 cfm Filtration HEPA Main Filter Size 16 in x 16 in x 11-1/2 In. Prefilter Size 17.5 in x 17.5 in x 2 In. Prefilter Type Polypad Discharge Dia 10 In. Decibels 67 Vacuum Gauge 0 to 5 in W.C. Construction Polished Aluminum Net Weight 75 lb.