7 hours in a burning aircraft?
Umm, forget the respirator. Someone should have stuck an apple in your teeth and shoved some stuffing up your bum because you would have been well cooked if that was true.
What makes you think you were exposed to anything toxic? Have you any symptoms? Or is this a generic "If I ever get a cancer I can blame it on this" sort of thing?
My point is that you really haven't done anything special in that thousands of other people are exposed to burning paint, metals, POL, plastics, etc. every day without protective gear and they do just fine.
So if you aren't ill why are you hitting the panic button and going 'Urgent" on us?