Here is what you need to know about respirator masks and their effectiveness to protect against COVID-19:What is a respirator mask? How often should respirator masks be switched out? Respirator masks and facial hairThere are certain facial hair styles that may interfere with the effectiveness in protection against the coronavirus while wearing respirators. Other effective respirator masksOther respirator masks approved by the National Institute for Occupational Safety and Health include N99, N100, P95, P99, P100, R95, R99 and R100, according to the CDC. Find respirator masks in HoustonTo find a list of medical supply stores selling N95 respirators and their availability click here.