Classic Air Laminar Air Flow enclosures with High Efficiency Particulate Air (HEPA with an efficiency of 99.997) filtration of exhaust air and an air barrier at the work opening. HEPA Filtered laminar airflow which is discharged to work zone, creates an ultra-clean work environment for product protection. An air barrier between the operator and the work zone is maintained by a flow of room air into a full width grille in the work opening.