The CDC has mentioned that the Coronavirus infecting America is imminent, so people are taking precautions by wearing different face masks and respirators in an effort to combat the virus!
The CDC is cautioning that facial hair can actually interfere with those devices being used!
Apparently some type of facial hair can keep the exhalation valve from working properly.
Below is a chart from the CDC showing which type of facial hairs are causing the danger and which ones are still acceptable!