5Biosafety Cabinetry:Design. Construction. performance, and Field Certification[ S]. NSF/ANSI 49 - 2008.
6European committee for standardization, The European standard EN 12469:2000. Biotechnology -performance criteria for microbiological safety cabinets[ S ]. British,2000.
7Cleanrooms and associated controlled environments - Part 3 Test methods[ S]. ISO 14644.3 First edition,2005 : 12.