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For example, a single six-foot hood operating 24/7/365 costs over $5,000/year to operate. [1] [2] In addition, CAV hoods do not react rapidly to airflow disturbances (turbulence) within the hood or within the laboratory and, hence, their sole purpose of containment and protection can be seriously compromised.
A fume hood is an example of an engineering control that uses local exhaust ventilation combined with an enclosure to isolate a worker from nanomaterials that may become airborne. Engineering controls for nanomaterials are a set of hazard control methods and equipment for workers who interact with nanomaterials .
A laboratory that uses a VAV fume hood with a sash that is kept open only during working hours of the day would save a significant amount on energy costs compared to a laboratory using CAV hoods that are fully open 100% of the time, regardless of sash height. [29] [40]
It is recommended that air exiting a fume hood should be passed through a HEPA filter and exhausted outside the work environment, with used filters being handled as hazardous waste. Turbulence can cause materials to exit the front of the hood, and can be avoided by keeping the sash in the proper position, keeping the interior of the hood ...
Normal safety procedures such as hand washing, not storing or consuming food in the laboratory, and proper disposal of hazardous waste are also administrative controls. [3]: 17–18 Other examples are limiting the time workers are handling a material or in a hazardous area, and exposure monitoring for the presence of nanomaterials.
A main part of engineering controls, "enclosure and isolation," creates a physical barrier between personnel and hazards, such as using remotely controlled equipment. As an example, fume hoods can remove airborne contaminants as a means of engineered control. [5]
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