It's called SCBA in Canada. We use 'air on demand', and subsequently insist that everyone be able to accomplish a perfect seal between facemask and skin. NO leaks.

Further to what Rowan noted, fire doubles in size every 30 seconds. It cannot be stressed enough that one should get out and stay out.

The materials inside structures are indeed so toxic that we even insist that for 48 hours after a fire people entering what's left of the structure wear SCBA because the toxic effects can last that long, even in well ventilated places.

We have LOTS of urban/forest interface here, and despite best efforts to get folks to cut the brush back from their houses people still insist on that 'country living' feeling. But we try.