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Field study of local exhaust hood performance.

Authors
Conroy-LM; Prodans-RS; Lachman-M; Yu-X; Perez-S
Source
Ventilation '94. Proceedings of the 4th International Symposium on Ventilation for Contaminant Control, held in Stockholm, September 5-9, 1994 1994:281-285
Link
NIOSHTIC No.
00236484
Abstract
The results of a field study examining the performance of slot hoods used to exhaust vapor degreasers were reported. A total of 16 degreasers, 13 of which used trichloroethylene (79016) and three each using methyl-chloroform (71556), perchloroethylene (127184), and methylene-chloride (75092), were studied by measuring hourly solvent concentration levels at various distances from the degreasers and in the local exhaust duct and by measuring ventilation and crossdrafts near the local exhaust hood. A semiempirical model was used to predict capture efficiency. Overall predicted and measured capture efficiencies were generally in good agreement; however, poor agreement was seen between predicted and measured efficiencies in daily averages for each degreaser. Possible reasons for this finding were discussed. No relationship was identified between increasing hood flow and hood capture efficiency. The authors conclude that the American Conference of Governmental Industrial Hygienists recommended flow of 50 cubic feet per minute/square foot of tank surface is not adequate for all conditions and that data from ongoing wind tunnel studies may be useful for the validation of more complex models for the prediction of hood performance.
Keywords
NIOSH-Grant; Control-technology; Training; Exhaust-hoods; Exhaust-systems; Exhaust-ventilation; Solvent-vapor-degreasing
Contact
Occupational and Environ Med University of Illinois 2035 W Taylor Street Chicago, Ill 60612
CAS No.
79-01-6; 71-55-6; 127-18-4; 75-09-2
Publication Date
19940101
Document Type
Conference/Symposia Proceedings
Funding Amount
7404259
Funding Type
Grant
Fiscal Year
1994
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T15-OH-07104
Priority Area
Control-technology
Source Name
Ventilation '94. Proceedings of the 4th International Symposium on Ventilation for Contaminant Control, held in Stockholm, September 5-9, 1994
State
IL
Performing Organization
University of Illinois at Chicago, Chicago, Illinois
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