4 ms·
I wear N95s and KN95s all the time. I can’t imagine how a person would think adding layers of filters in front of their mouth would not restrict breathing. It’s
by gfodor 5y ago
I wear N95s and KN95s all the time. I can’t imagine how a person would think adding layers of filters in front of their mouth would not restrict breathing. It’s basic physics - you have to expend energy to pull the air through the filter.