What type of ventilation should be installed in the laboratory?
|Flinn Scientific recommends you ventilate your chemical storage
area a minimum of four air changes per hour. The best type of
design is to have a fan mounted on an exterior wall of your
chemical storeroom. Have sheet metal ductwork extend down from the
fan to within 12" from the floor. The ductwork should be a minimum
of 12" wide and 8" deep. See Figure.
The purpose for this design is to have ceiling to floor ventilation. Most organic vapors are heavier than air and sit at floor level. It only makes sense that the air to be ventilated be drawn from floor level.