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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 .
Fume hoods were introduced about 100 years ago to safeguard personnel working with hazardous materials. While many changes and improvements have been made, the basic concept and design of fume hoods remains the same. Air is drawn from the workplace, around the worker and into the front of the hood, and is then exhausted out of the laboratory.
The most basic design of a CAV fume hood only has one opening through which air can pass—the sash opening. [5] Closing the sash on a non-bypass CAV hood will increase face velocity (inflow velocity or "pull"), [a] which is a function of the total volume divided by the area of the sash opening. Thus, the hood's performance (from a safety ...
The design of an effective kitchen ventilation system is determined by: The kitchen's workload; The amount, type and power of cooking equipment; The kitchen's layout and shape; The number of kitchen staff; The need for easy cleaning and maintenance; Energy efficiency; Hot air from cooking is usually vented externally through a chimney system.
Fume hood Glove box A biosafety cabinet ( BSC )—also called a biological safety cabinet or microbiological safety cabinet —is an enclosed, ventilated laboratory workspace for safely working with materials contaminated with (or potentially contaminated with) pathogens requiring a defined biosafety level .
A biosafety cabinet is also easily-confused with a laminar flow cabinet, but like the fume hood is primarily designed to protect the worker rather than the biological samples. This is achieved by drawing surrounding air in and exhausting it through a HEPA filter to remove potentially hazardous microorganisms.
A kitchen hood in a small apartment. A kitchen hood, exhaust hood, hood fan, extractor hood, or range hood is a device containing a mechanical fan that hangs above the stove or cooktop in the kitchen. It removes airborne grease, combustion products, fumes, smoke, heat, and steam from the air by evacuation of the air and filtration. [1]
Grease duct exhaust fan. A grease duct is a duct that vents grease-laden flammable vapors from commercial cooking equipment such as stoves, deep fryers, and woks to the outside of a building or mobile food preparation trailer.