[Video 3 min 22 sec, 7/14/20, Gregory Langston, 30,497 views]
Face Mask Comparison Using vaping
(1) No mask
(2) Cloth mask
(3) Surgical $0.03
(4a) KN95 - poor fit
(4b) KN95 $0.45
(5) N95 $0.63
https://coronavirus.quora.com/Face-Mask-Comparison-Using-Vaping
Face Mask Comparison Using vaping
(1) No mask
(2) Cloth mask
(3) Surgical $0.03
(4a) KN95 - poor fit
(4b) KN95 $0.45
(5) N95 $0.63
https://coronavirus.quora.com/Face-Mask-Comparison-Using-Vaping