Bigneat’s Biological Protection Enclosure LAC2 Class II type enclosure is constructed following years of experience. LAC2 provides operator and sample/process protection in closed or open conditions. The enclosure interior is accessible through sliding windows in the lower door (access 325mm high) through which high velocity inflow air enters (minimum 0.4m/s) providing operator protection and sample/process protection. This laboratory air then flows into a profiled grille extending the full width across the front of the enclosure.