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Chemical Fume Hoods
A chemical fume hood is a local exhaust unit with rear and side walls designed to effectively control atmospheric contamination (hazardous gases, vapors and/or fumes) at its source. The chemical fume hood depends upon the creation of air flow past the source of contaminant sufficient to remove the highly contaminated air around the source or issuing from the source and to draw the air into an exhaust system vented directly to the outdoors. It should have an average linear face velocity of 80 to 120 linear feet per minute (lfpm); hoods used for radioactive materials activities must have a minimum of 125 lfpm.
