Bullard Clean Air Boxes (CAB) offer superior breathing air filtration in a durable easy to use format. OSHA requires that employers provide their workers wearing airline respirators with Grade D breathing air. Bullard Clean Air Boxes provide 3-stage filtration and carbon monoxide (CO) monitoring to help meet this requirement. Clean Air Box Three-Stage Filtration Three stages of filtration remove oil, water, particulate, oil vapor and odors. First Stage - The first filter element removes 95% of solid contaminants and bulk liquids from the breathing air, down to five microns, prolonging the life of the second and third stage elements. Second Stage - This high efficiency filter element removes particulates and extremely fine oil mists down to .01 microns Third Stage - This activated charcoal element removes unpleasant oil and hydrocarbon vapors and odors from the air. Auto-Calibration Bullard's Clean Air Box utilizes auto-calibration - one of our most valued features! Read about calibration from ISHN. Rugged construction: polycarbonate Pelican® cases (portable units) and powder coated steel (wall mount units) Automatic condensate drains extend filter element life Independent regulators (optional) Filter change indicators visually alert the operator to replace element Replacement filters are compatible with other brands of filtration panels Auto calibration takes less than 90 seconds with no tools High intensity 90 dB alarm; remote capable with strobe Self-contained, with 80+ hours of operation on 8-AA batteries; 110VAC power cord also included Please contact us or email us (enquiry@techhaus.advpg.com) for Rental units. read more