NSF International (The National Sanitation Foundation) ( http://www.nsf.org/ )is The Public Health and Safety Company™, providing public health and safety risk management solutions to companies, governments and consumers around the world. he NSF Biosafety Cabinetry Program was initiated over 25 years ago at the request of the regulatory community, including the Centers for Disease Control (CDC), National Institutes of Health (NIH), and the National Cancer Institute (NCI). The first phase of the program was the development of NSF/ANSI Standard 49 for the evaluation of Class II laminar flow biological safety cabinets. The standard was completed in 1976, followed by the implementation of a testing and certification program to that standard, titled the Biosafety Cabinetry Certification Program. The third and final stage was completed in 1993, titled the Biosafety Cabinet Field Certifier Accreditation Program. NSF/ANSI Standard 49 Class II (laminar flow) biosafety cabinetry applies only to Class II biological safety cabinets, as designed to minimize the hazards inherent in working with agents assigned to biosafety levels 1, 2, or 3.