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Filtering by: Creator Woodfield, Marion J. Remove constraint Creator: Woodfield, Marion J. Keyword breathing zone Remove constraint Keyword: breathing zone

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  • Dataset for: Influence of face shields on exposures to respirable aerosol

    Description:
    The objective of this study was to determine the influence of face shields on the concentration of respirable aerosols in the breathing zone of the wearer. The experimental approach involved the generation of poly-dispersed respirable test dust aerosol in a low-speed wind tunnel over 15 minutes, with a downstream breathing mannequin. Aerosol concentrations were measured in the breathing zone of the mannequin and at an upstream location using two laser spectrophotometers that measured particle number concentration over the range 0.25-31 µm. Three face shield designs were tested (A, B and C), and were positioned on the mannequin operated at a high and low breathing rate. Efficiency – the reduction in aerosol concentration in the breathing zone – was calculated as a function of particle size and overall, for each face shield. Face shield A, a bucket hat with flexible shield, had the highest efficiency, approximately 95%, while more traditional face shield designs had efficiency 53-78%, depending on face shield and breathing rate. Efficiency varied by particle size, but the pattern differed among face shield designs. Face shields decreased the concentration of respirable aerosols in the breathing zone, when aerosols were carried perpendicular to the face. Additional research is needed to understand the impact of face shield position relative to the source.
    Keyword:
    wind tunnel, aerosols, face shield, breathing zone, breathing rate, mannequin, infection prevention, and particle size
    Subject:
    Medicine
    Creator:
    Sleeth, Darrah K., Jones, Rachael M., and Woodfield, Marion J.
    Owner:
    Rachael Jones
    Based Near Label Tesim:
    Salt Lake City, Utah, United States
    Language:
    English
    Date Uploaded:
    09/03/2021
    Date Modified:
    12/08/2023
    Date Created:
    2020-08-13 to 2020-11-10
    License:
    CC BY NC - Allows others to use and share your data non-commercially and with attribution.
    Resource Type:
    Dataset