Determining Facial Covering Efficacy

ASSP Great Plains Chapter Presents:
Determining Facial Covering Efficacy

FREE Webinar
Tuesday, September 29, 2020
Time: 11:30am-1:00pm Central
View/Print Flyer (PDF)

With the help of Dr. Martin Fischer, Duke University, who published the paper, “Low-cost measurement of face mask efficacy for filtering expelled droplets during speech” (Duke University Paper), the Great Plains Chapter has sponsored the development of a similar testing chamber.

Presenters: This event will be hosted by Doris Burns, MPH, CSP, EurOSHM, Chris Kerber, UNMC Professor Chandran Achutan, PhD, CIH and UNMC Students.

Facial Covering Testing: The test method demonstrated during this presentation will be made available to our Great Plains Chapter members (in exchange for a nominal donation to the Chapter) so they can have their facial coverings tested.  Please keep in mind that this is NOT a certified test method, only an indication of efficacy and no inferences are made as to the ability of facial covering to prevent or protect anyone from disease. Details to be provided during the presentation.

Schematic of Experimental Setup:
A laser beam is expanded vertically by a cylindrical lens and shined through slits in the enclosure. The camera is located at the back of the box, with a hole for the speaker in the front. The inset shows scattering for water particles from a spray bottle with the front of the box removed. Photo credit: Martin Fischer, Duke University.

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