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

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

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FIG. 3. — Pipe fog visualization showing an N95 respirator with an exhalation valve (left), N95 without an exhalation valve (center), and no mask (right). Flow is from right to left. The open pipe has a 51 mm diameter. Multimedia view: https://doi.org/10.1063/5.0031996.3Download video file^{(5MB, mp4)}DOI: 10.1063/5.0031996.3