Publish Time: 2021-11-01 Origin: Site
Inhalation is the main way for chemicals to enter the body. Chemical fumes and vapors can enter our blood directly, and small particles can stay in our alveolar area, endangering our health. Correct operation of a fume hood that conforms to the design can reduce exposure to harmful smoke, steam, gas, and dust. The fume hood restricts harmful airborne materials by diluting harmful substances in the air with a large amount of air, sucking them into the exhaust system, and then exhausting the air from the vents located on the roof of the building 18. The correct use of fume hood window frames can also shield workers from uncontrolled reactions. Fume hoods are inspected and tested every year to evaluate performance standards, but the safe use of fume hoods is up to you.
• Perform all work involving hazardous or volatile materials in a fume hood.
• Check if the fume hood is operating properly before starting work. In order to check the airflow, a piece of paper, paper towel or ribbon can be taped to the fume hood window frame.
• Avoid cross airflow and destructive airflow in front of the fume hood. Make sure that the doors and windows near the fume hood are closed.
• Always place work at least 15 cm away from the fume hood opening.
• When boiling materials or experimenting with reactive chemicals, use a belt as a safety shield.
• Always keep the waist belt as low as possible. As the window frame is lifted, the flow rate increases, so that the air surface velocity on a given cross-section of the window sash opening is constant. Especially in summer, this means that more hot make-up air is sucked into the laboratory.
• When not using a fume hood, make sure that all materials are in a sealed container.
• Connect all electrical equipment outside the enclosure to avoid sparks that could ignite flammable or explosive chemicals.
• Do not put your face or head in the hood. Put your hands outside as much as possible.
• Do not use fume hoods as storage areas, they should only contain working chemicals.
• Do not use a fume hood to discharge or dispose of hazardous materials through air dilution.
• Do not make the fume hood overcrowded or cluttered. Overcrowded eddy currents and dead ends. Vortex may cause harmful substances backflow from the fume hood, resulting in exposure; dead spots may be allow combustibles and combustible concentration of combustibles accumulate materials; the large and heavy equipment used in the hood will bause vortex. These can be reduced by ensuring.
• Do not place the device in a hood that blocks the window frame closure. There may be safer local exhaust ventilation methods, and should be held accountable.
• Do not modify the fume hood or set up shelves in the fume hood for chemical or equipment storage.
• Do not place power strips or other spark sources inside the hood.