Biological Safety Cabinet (BSC) use to minimize personnel exposure when working with biological materials, and dividing to three classes (Class I + Class II + Class III) based on biological agents and risk degree. Class I cabinet exhaust 70% and recirculate 30% of air to provide only personal and environmental protection (Suitable for microbiology researches). Class II cabinet provide personal environment and product protection (Divided in types (A1, A2, B1 and B2) so it exhaust 70% and recirculate 30% of air except type B2 have 100% exhaust without air recirculate (Suitable for microbiological and biomedical researchers). Class II cabinet provide highest degree of protection for personal, environment and products because of it enclosed totally with arm length with gloves to attach manipulated agents inside cabinet (Suitable for highest sensitive researchers) #geneticteacher

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