“Pureair” Biosafety Cabinet Class II Type A1 is designed for protection of operator, product and environment from pathogenic agents and microorganisms transmitted in respiratory way and also for creation of a bacterial dust free air environment. It has a common plenum from which 30% of air is exhausted, and 70% re-circulated to the work area as the downflow. For further details http://www.pureairsystemindia.com/products/bio-safety-cabinets/