Filter Mask

an air-purifying respirator, in which respirable air is obtained by filtering a contaminated atmosphere https://en.wikipedia.org/wiki/Respirator

important reducer of spread of COVID-19 and other airborne illnesses

• see KN-95, N-95, KF-94

Flo-Mask: $90 for holder, $1/refill https://www.flomask.com/