Class I, II and III cabinets biohazard hoods available. These hoods / cabinets are designed to work with biohazard materials. They maintain negative air pressure while HEPA filtering internal air to prevent potentially contaminated air from exiting the cabinet. Three primary objectives of biohazard hoods are to protect the operator from pathogenic contaminants, to protect the product from contamination and to protect the lab environment from pathogens and contaminants within the hood. Can be used in microbiology research and quality control (QC) labs, university labs, hospitals and other biosafety hazard work environments.