Offering uniform and quiet airflow, the plenum designed Unique Esco Dynamic Chamber™ uses 50% less energy than it's competitors. By preventing blockage a raised airflow grille makes this machine quite safe. Contaminated positive pressure plenum is surrounding by negative pressure plenum causing fabric bags to be absent from the design. For exhaust and supply of airflow a long-lasting, dual ULPA filter is provided. Cabinet functions are overseen by the presence of a Esco Sentinel™ microprocessor. For comfortable reaching, the cabinet offers an ergonomic, angled front. Measuring 25.4 mm (1") the working opening gives additional work space by being larger than the tested sash. The shatterproof, frameless sash is comprised of one piece and offers a large, unobstructed viewing area. It is simple to clean.