Tracer Gas Evaluations of Push-Pull Ventilation System Performance

A push-pull ventilation system is effective for hazardous material exhaustion. Although a push-pull ventilation system has advantages over a local exhaust hood, some laborious adjustments are required. The pertinence of the adjustments is uncertain because it is difficult to evaluate the performance...

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Bibliographic Details
Published inIndustrial Health Vol. 47; no. 1; pp. 94 - 96
Main Author OJIMA, Jun
Format Journal Article
LanguageEnglish
Published Japan National Institute of Occupational Safety and Health 2009
Subjects
Capture efficiency
Gases - analysis
Hazardous Substances
Japan
Push-pull ventilation system
Tracer gas
Ventilation - methods
Ventilation - standards
Japan
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Summary:A push-pull ventilation system is effective for hazardous material exhaustion. Although a push-pull ventilation system has advantages over a local exhaust hood, some laborious adjustments are required. The pertinence of the adjustments is uncertain because it is difficult to evaluate the performance of a push-pull ventilation system quantitatively. In this study, a measurement of the capture efficiency of a push-pull ventilation system was carried out by means of a tracer gas method. The capture efficiency decreased to 39.3-78.5% when blockage material, a dummy worker and a cross draft, were set in the ventilation zone, but the efficiency was 95.1-97.9% when the cross draft was stopped. The results suggest that the uniform flow of a push-pull ventilation system will detour a blockage and the performance of the system will not be reduced unless a cross draft disturbs the uniform flow.
ISSN:0019-8366
1880-8026
DOI:10.2486/indhealth.47.94