National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Field Study of Local Exhaust Hood Performance.

PB97104889

Publication Date	1993
Personal Author	Conroy, L. M.; Prodans, R.; Lachman, M.; Yu, X.
Page Count	153
Abstract	The performance of slot hoods to exhaust vapor degreasers was investigated, and a comparison was made of predicted and measured capture efficiencies. Sixteen degreasers were studied in facilities located in the Chicago area. The capture efficiency of the hoods was measured, along with the direction and magnitude of cross drafts in the vicinity of the local exhaust hood. A comparison was then made of field measurements with existing design recommendations. Measured cross drafts ranged from near 0 to more than 120 feet per minute. Measured workspace emission rates ranged from near 0 to 211 grams/minute. Measured duct emission rates ranged from near 0 to 258 grams/minute. Measured capture efficiencies ranged from 0.09 to 1.00. Predicted capture efficiencies ranged from 0.52 to 0.86. The measured hood flow rates ranged from 36% to 349% of the recommended flow rate of 50 cubic feet per minute/square foot. For some conditions the recommended flow rate appeared to be adequate, but it was inadequate for others.
Keywords	Degreasers Solvent vapors Air pollution control Air fow Control technology Exhaust ventilation Chicago(Illinois)
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	68A - Air Pollution & Control 89H - Building Equipment, Furnishings, & Maintenance 97R - Environmental Studies
Corporate Authors	Illinois Univ. at Chicago. School of Public Health.; National Inst. for Occupational Safety and Health, Morgantown, WV.
Supplemental Notes	Sponsored by National Inst. for Occupational Safety and Health, Morgantown, WV.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	199701

Field Study of Local Exhaust Hood Performance.

Field Study of Local Exhaust Hood Performance.
PB97104889

Publication Date	1993
Personal Author	Conroy, L. M.; Prodans, R.; Lachman, M.; Yu, X.
Page Count	153
Abstract	The performance of slot hoods to exhaust vapor degreasers was investigated, and a comparison was made of predicted and measured capture efficiencies. Sixteen degreasers were studied in facilities located in the Chicago area. The capture efficiency of the hoods was measured, along with the direction and magnitude of cross drafts in the vicinity of the local exhaust hood. A comparison was then made of field measurements with existing design recommendations. Measured cross drafts ranged from near 0 to more than 120 feet per minute. Measured workspace emission rates ranged from near 0 to 211 grams/minute. Measured duct emission rates ranged from near 0 to 258 grams/minute. Measured capture efficiencies ranged from 0.09 to 1.00. Predicted capture efficiencies ranged from 0.52 to 0.86. The measured hood flow rates ranged from 36% to 349% of the recommended flow rate of 50 cubic feet per minute/square foot. For some conditions the recommended flow rate appeared to be adequate, but it was inadequate for others.
Keywords	Degreasers Solvent vapors Air pollution control Air fow Control technology Exhaust ventilation Chicago(Illinois)
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	68A - Air Pollution & Control 89H - Building Equipment, Furnishings, & Maintenance 97R - Environmental Studies
Corporate Authors	Illinois Univ. at Chicago. School of Public Health.; National Inst. for Occupational Safety and Health, Morgantown, WV.
Supplemental Notes	Sponsored by National Inst. for Occupational Safety and Health, Morgantown, WV.
Document Type	Technical Report
Title Note	Final rept.
NTIS Issue Number	199701