Factors affecting the design of local exhaust ventilation for the control of contaminants from hand-held sources

Technical Report · Thu Feb 01 04:00:00 EST 1990

OSTI ID:5675250

Flynn, M R; Shelton, W K

Measurements were made of tracer gas concentrations in the breathing zone of a mannequin positioned in front of flanged circular exhaust hoods arranged in various configurations. The gas was generated from a hand held source. The results indicated that the mannequin was subjected to less hazardous conditions when placed to the side of the hood rather than in the conventional orientation with the source between the body and the hood. The experiments showed that there was an increase in exposure as the distance decreased between the source and the hood for small hoods. This was an unexpected finding. The authors stress the importance of considering worker practices when evaluating the effectiveness of engineering controls. Factors which determine the exposure of the individual working in the hood include the mass flow of pollutant, the source configuration and momentum, the hood air flow, the hood size and shape, the distance of the worker from the hood, and the position of the worker and source with respect to the hood.

• Research Organization: North Carolina Univ., Chapel Hill, NC (United States). Dept. of Environmental Sciences and Engineering
• OSTI ID: 5675250
• Report Number(s): PB-91-189001/XAB; CNN: R01-OH-02392
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR FLOW
AIR POLLUTION
AIR POLLUTION CONTROL
AIR POLLUTION MONITORING
CONTROL
DESIGN
ECOLOGICAL CONCENTRATION
EQUIPMENT
EXHAUST GASES
FLUID FLOW
FLUIDS
FUME HOODS
GAS FLOW
GASEOUS WASTES
GASES
INDOOR AIR POLLUTION
LABORATORY EQUIPMENT
OCCUPATIONAL EXPOSURE
POLLUTION
POLLUTION CONTROL
SIMULATION
VENTILATION
WASTES