Face shield is irrelevant. The hose goes from the mouthpiece to the air pack. Doesn't matter how good your gear is, entanglements happen to firefighters and cause fatalities. That's why they drill disentanglement procedures so thoroughly throughout firefighter training. And again, the inability to verbally communicate with a mouthpiece makes it a moot point. You're worthless if you can't talk to your crew during an incident, and you're dead if you can't call a mayday on the radio if the shit hits the fan.

There is literally no solution other than to shave your beard. This is utter foolishness. Either shave the beard or find yourself another job. There is no place in this industry for people who put their personal religious beliefs before safety. There are so many ways to get yourself and your crew killed in a fire I have zero patience for someone who can't respect the safety rules and do the job right, and if these religious liberty nuts had ever served as firefighters they'd never have taken the case to begin with.