Class II Biohazard Safety cabinet should provide personnel, product & environment protection.
Class II Cabinets differ in proportion as 100% air is exhausted from the cabinet through high efficiency particulate air (HEPA/ULPA) filtration.
Velocity of airflow to the work zone creates an class 100 environment for product protection, where the remaining exhaust air is discharged out through (HEPA/ULPA).
Air barrier at the work opening & the contaminated air plenum under positive pressure. An air barrier between the operator & the work zone maintained by a flow of room air through a full width grille in the work opening.