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. 2020 Nov 1;32(11):111703. doi: 10.1063/5.0031996

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© 2020 Author(s).

1070-6631/2020/32(11)/111703/5/$0.00

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FIG. 2. — Still images extracted from the video footage of the mannequin exhaling with an exhalation valve (left), no exhalation valve (center), and no mask (right). The original video footage was captured at 125 FPS. Multimedia view: https://doi.org/10.1063/5.0031996.2Download video file^{(1.6MB, mp4)}DOI: 10.1063/5.0031996.2