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Chemical fume hoods constructed with a tall interior (e.g., 2 meters/6.5 feet) that permits roll-in and accommodation of heavy, bulky equipment. These hoods are constructed with chemical-resistant plastics or metals; they are usually mounted on the floor as stand-alone units. Walk-in hoods permit personnel to enter the hood, but the operators should not stay inside the hood when chemical fumes are generated. Walk-in chemical fume hoods are not biological safety enclosures; they should not be used when infectious or potentially infectious materials are handled.
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