A self-contained work area inside a laboratory room from which potentially dangerous fumes are exhausted from the enclosed work surface by means of a separate air exhaust system. Fume hoods can be bench-type, in which the researcher reaches into the hood to work, or walk-in types in which the researcher enters a chamber to do experiments. The velocity of exhaust air typically needed for fume hood operation ranges from 80 to 110 fpm. Accommodating researchers' individual preferences, ensuring safety, solving the HVAC problems caused by researchers leaving fume hood doors open, responding to the trends toward larger hoods and bearing associated expenses are important planning issues for R&D labs.
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