Purifier Class I Enclosures protect the user from agents that require Biosafety Level 1, 2 or 3 containment but no product protection. Exclusive features include: ergonomic air foil with aerodynamic Clean-Sweep airflow openings, upper dilution air supply, zone-perforated rear baffle, side-entry air foils, and upper containment sash foil. Other features include: nominal inflow velocity of 75 to 105 fpm, 99.99% efficient exhaust HEPA filter, variable speed built-in blower with vibration-isolated impeller and solid state control rated for 2 amps, intrinsically-safe, negative pressure design, Minihelic pressure gauge, low discharge volume and quiet operation, epoxy-coated aluminum and steel construction, fluorescent and 254 nm UV lamps, blower switch and 3-way light switch: UV, off and fluorescent, 1/4" thick tempered safety glass front sash and sides, 9.44" high sash opening, ergonomic 10° angled and hinged sash that pivots upward, locks to a loading height of 20" and has side wiping seals to contain contaminants, two utility ports, particulate containment tested, and one-year warranty on parts and service.