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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 ...
Despite their similar appearance, a laminar flow cabinet should not to be confused with a fume hood. A laminar flow cabinet blows unfiltered exhaust air towards the worker and is not safe for work with pathogenic agents, [ 2 ] : 13 [ 3 ] while a fume hood maintains negative pressure with constant exhaust to protect the user, but does not ...
Smoke hoods are a class of emergency breathing apparatus intended to protect victims of fire from the effects of smoke inhalation. [2] [3] [4] A smoke hood is a predecessor to the gas mask. [5] The first modern smoke hood design was by Garrett Morgan and patented in 1912. [6]
All exhaust air is HEPA-filtered as it exits the biosafety cabinet, removing harmful bacteria and viruses. [2] This is in contrast to a laminar flow clean bench, which blows unfiltered exhaust air towards the user and is not safe for work with pathogenic agents. [3]: 13 [4] Neither are most BSCs safe for use as fume hoods. [2]
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]
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