This looks like the same type of mask used in bag masks for providing ventilation, in which case a beard can significantly compromise the seal. Our anesthesiolo

This looks like the same type of mask used in bag masks for providing ventilation, in which case a beard can significantly compromise the seal. Our anesthesiologists here recommend shaving your beard for higher risk patients undergoing anesthesia in case they need to be bagged. However beards don't render the mask totally ineffective.