Therefore when you use a hood keep the sash closed or

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Unformatted text preview: , especially air vents in the ceiling of the room that are near the hood. A hood’s airflow can also be disrupted by drafts from windows or doors and even by a change of position of the worker at the hood. Therefore, when you use a hood, keep the sash closed, or open it only the minimum amount necessary. Keep your face outside the plane of the hood sash. Place your equipment and do your work within the hood, at least 15 cm (6 in.) from the front edge of the fume hood. 27 students short index 1/15/03 12:45 PM Page 28 That is, work as far back in the hood as practical, but do not block the rear vent openings. When it is necessary to contain or collect waste solvents or toxic vapors, the apparatus used in a hood should be fitted with condensers, traps, or scrubbers, as appropriate. Hoods are not an appropriate means for disposing of hazardous waste chemicals or evaporating solvents. Only hoods designed for the purpose may be used for work with perchloric acid. A laboratory hood is not a storage cabinet. Chemicals stored in the hood can interfere with efficient hood operation, and, in the event of an accident or fire, every item in the hood may become involved. Precautions for Using Electrical Equipment Electrical currents of low amperage and voltage under certain circumstances may result in fatal shock. Voltages as low as 24 V AC can be dangerous and present a lethal threat. Comparably low-voltage DC circuits do not normally present a hazard to human life, although severe burns are possible. The longer contact with a live circuit lasts, the worse the damage, especially for burns. Follow these recommendations: ● Only individuals qualified by training or experience should maintain or repair electric or electronic equipment. ● Do not use electric wires as supports. Never pull on live wires. ● Immediately report any electrical failure or any evidence of equipment overheating. ● Inspect all electrical equipment periodically to be certain the insulation on the cords is no...
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This document was uploaded on 02/27/2014 for the course PHYS 1B at UCSD.

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