The document discusses biosafety cabinet class I, which provides environmental protection from hazardous substances. It notes that class I biosafety cabinets have stainless steel construction, HEPA filtration of exhaust air, and are portable. They are used in pharmaceutical, medical and research settings to prevent microbiological contamination and cross-contamination. Features include microprocessor controls, pass-through boxes, and optional accessories like UV lights. Class I biosafety cabinets provide protection for personnel and the environment, but not products.