37 Biosafety Manual cabinets should be run 24 hours a day, 7 days a week. Annual Certification Testing To ensure that BSCs are providing necessary protection to workers and the environment, a contracted, qualified servicing company provides annual certification testing for all BSCs on campus that are used to contain biological hazards. Testing is done according to the internationally accepted standards of NSF International. Each BSC should have a label displaying the date it was last certified. Moving or Repairs Filter changes and repairs must be done by the contracted, qualified servicing company. This company will also be responsible for filter disposal. BSCs must be recertified whenever they are moved, repaired, or have the filters changed. EH&S coordinates annual certification and can arrange testing and repairs upon request. Purchasing and Installing a New BSC If plans exist for the purchase of a new BSC, EH&S must be notified to provide assistance in choosing the appropriate BSC and for ensuring that the BSC is put on the annual certification testing schedule. The guidelines purchasing and installation must be followed. • The BSC must be certified by an NSF accredited technician according to NSF/ANSI 49 Standard. Work with any materials classified as requiring BSL-2 or higher containment will not be permitted in a BSC that does not pass certification testing for containment. • EH&S must verify that the BSC type (Class II Type A2, etc.) is appropriate for the work to be done. • Any outlets inside the work area of the BSC should be ground fault circuit protected (GFCI) outlets. • Installation of BSCs must allow access to both supply and exhaust filters for annual certification testing and filter changes. • The top of the BSC must be far enough below the ceiling (at least 18 inches) to allow field testing of exhaust flow according to NSF/ANSI 49-2019. • Any connections to exhaust duct work must allow access for field testing of exhaust flow according to NSF/ANSI 49-2019.