The CellGard ES NU-477 bench Laminar Flow Biological Safety Cabinet (LFBSC) is known as a Class II, Type A2 Biological Safety Cabinet. This is possible since NuAire's cabinet conforms to the following requirements: 1. Maintains inflow velocity of 100 LFPM (.51 M/S) through the work access opening. 2. Has HEPA filtered downflow air that is mixed with the inflow air from a common exhaust plenum. 3. Exhaust airflow can either be room re-circulated or exhausted outside using a canopy exhaust transition. 4. Has all biologically contaminated ducts and plenums under negative pressure or surrounded by negative pressure.