Fume hood is the most commonly used exhaust equipment in the laboratory for the part area air ventilate, it is many variety, due to the different structure, use condition is different, the ventilation effect is not the same. The performance of the fume hood, mainly depends on the speed of the moving the air of the fume hood.
 
Laboratory ventilation is an indispensable part of in the design of laboratory. In order to make the laboratory staff don't inhale or pharynx into some unknown toxic and can cause or toxicity of chemicals and organisms, the laboratory should have good ventilation. To prevent some of the steam, gas and particles (smoke, soot, dust and air suspension) absorption of pollutants must be used fume hoods and ventilation hood or local ventilation method to remove.