Question: When Caleb is in the house rescuing a young girl, would it really have made sense for Caleb to take off his mask, and put it on the child he is rescuing? I mean the child was unconscious, and he would still need oxygen. It's really hard to breathe in buildings. I would like an actual firefighter to answer this question.
Answer: I'm not a Firefighter but I believe that the masks are uncomfortable and he took it off so he can work faster. It only makes since to give the mask to the unconscious girl because it might help her breathe better or start to breathe again. He is trained to do these types of things.
Caleb would have a pretty hard time breathing by taking his the oxygen mask off.
Answer: As a Firefighter, in a fire your own life and safety are your top priority. You can't save anybody if you become a casualty. And you never take your mask off. We are trained to work in all our gear, it all stays on until we come out.