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Improved local exhaust control by directed push-pull ventilation system.

V Hampl, R T Hughes

    American Industrial Hygiene Association Journal
    |January 1, 1986
    PubMed
    Summary
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    Directed push-pull ventilation significantly reduces workplace smoke exposure. This local exhaust ventilation technique can decrease required airflow by 50%, improving worker breathing zone air quality.

    Area of Science:

    • Industrial Hygiene
    • Occupational Safety
    • Ventilation Engineering

    Background:

    • Local exhaust ventilation (LEV) is crucial for controlling workplace contaminants.
    • Traditional LEV systems may require high airflow rates, increasing energy consumption.
    • Worker proximity to contaminant sources poses challenges for effective ventilation.

    Purpose of the Study:

    • To evaluate the effectiveness of a directed push-pull ventilation system.
    • To assess contaminant reduction in a simulated worker's breathing zone.
    • To determine the impact on required exhaust system airflow rates.

    Main Methods:

    • Experiments utilized a directed push-pull ventilation setup with a square hood exhaust.
    • Push systems employed slot or round jets positioned relative to a mannequin.

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  • Smoke was used as a surrogate contaminant to measure breathing zone concentrations.

    • Main Results:

    • The push-pull system effectively reduced smoke in the simulated worker's breathing zone.
    • Required exhaust system airflow decreased by approximately 50% without compromising capture.
    • No significant performance difference was observed between slot and round jets.

    Conclusions:

    • Directed push-pull ventilation is an effective strategy for reducing contaminant emissions.
    • Optimal jet placement is critical to minimize interference from worker-induced eddy currents.
    • This system offers potential for energy savings and improved workplace air quality.