Occupational hygiene efficiency

For evaluation the velocity distribution and capture velocity could be used. Since the worker is quite close to the contaminant-generating place, occupational hygiene efficiency is possible (Section 10.5). 

For exterior hoods, the measurement of capture velocity provides a quick check of the ideal design conditions. However, it must be remembered that capture velocity is not a direct measure of the ability of an exterior hood to provide personnel protection. Other efficiency measures are required in order to evaluate its performance in practice. The following two efficiency measurements could be useful capture efficiency and occupational hygiene efficiency. These measures complement each other. 

The occupational hygiene efficiency (tj ,) is defined as the ratio of the contaminant concentrations in the operator s breathing zone (Cj,) with the exhaust hood operating and not operating ... 

This gives a direct measure of the benefits obtained by the hood. In practice, the best way to determine the occupational hygiene efficiency is to measure the actual concentrations in the operator s breathing zone for those two cases. A tracer can also be used with the limitations described above. 

Occupational hygiene deals not only with overt threats to health but also in a positive sense with the achievement of optimal comfort conditions for workers, i.e. the reduction of discomfort factors which may cause irritation, loss of concentration, impaired work efficiency and general decreased quality of life. 

The research aims to contribute to strengthening the scenario of occupational hygiene, health and safety of workers in the sector of poultry production, ensuring the efficiency of individuals, preventing them from occupational diseases, assessing the environmental comfort and the risks... 

Martin, S.B., B.R. Beamer, and E.S. Moyer. 2006. Evaluation of a high-efficiency, filter-bank system. Journal of Occupational and Environmental Hygiene 3 204-213. 

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