These enclosures are designed for a nominal inflow velocity of 75 to 105 fpm. They are calibrated for use with 99.99% efficient exhaust HEPA filters. Includes a built-in variable speed blower with vibration-isolated impeller. These class I enclosures are built with an intrinsically-safe, negative pressure design. Available with fluorescent and 254 nm UV lamps, a UV protection panel is interlinked. The ergonomic 10° angled and hinged sash pivots upward, locks to a loading height of 20" and has side wiping seals to contain contaminants. Also includes two utility ports. Particulate containment tested. These enclosures use exhaust HEPA filters to provide user and environmental protection, but no product protection. UV lamps provide secondary decontamination.