Field study of local exhaust hood performance.

Details

• Personal Author:
  Conroy LM ; Lachman M ; Perez S ; Prodans RS ; Yu X
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Occupational Health Safety Solvents Staff Development Ventilation
• Keywords:
  NIOSH-Grant; Control-technology; Training; Exhaust-hoods; Exhaust-systems; Exhaust-ventilation; Solvent-vapor-degreasing
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Proceedings
• Place as Subject:
  Illinois ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  281-285
• NIOSHTIC Number:
  nn:00236484
• Citation:
  Ventilation '94. Proceedings of the 4th International Symposium on Ventilation for Contaminant Control, September 5-9, 1994, Stockholm. 1994 Sep; :281-285
• Contact Point Address:
  Occupational and Environ Med University of Illinois 2035 W Taylor Street Chicago, Ill 60612
• CAS Registry Number:
  1,1,1-Trichloroethane (CAS RN 71-55-6) ; Dichloromethane (CAS RN 75-09-2) ; Tetrachloroethylene (CAS RN 127-18-4) ; Trichloroethylene (CAS RN 79-01-6)
• Federal Fiscal Year:
  1994
• Performing Organization:
  University of Illinois at Chicago, Chicago, Illinois
• Peer Reviewed:
  False
• Start Date:
  19770930
• Source Full Name:
  Ventilation '94. Proceedings of the 4th International Symposium on Ventilation for Contaminant Control, September 5-9, 1994, Stockholm
• End Date:
  19960630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7dc847c09aedf140bc731323e8446b4703641ae07d6ad9e7b7238120dab30b8f7dcaa9b938d34d035f87873a0fe7fec262d5d13dcaf290925445e82b6de3b57d
• Download URL:
  https://stacks.cdc.gov/view/cdc/243553/cdc_243553_DS1.pdf
• File Type:
  [PDF - 168.02 KB ]