Both fires destroyed the kitchens, but there was one major difference to the damage in the other rooms. One lady had learned to keep all the doors closed. In that house there was minimal smoke damage in the closed off rooms. The fire didn't have the air-flow it needed to spread quickly. The other house had all the doors open and the smoke damage was significant.
Now I know this has nothing to do with writing, but when you learn something important you want to share it. These two houses were vivid enough to my husband that we have started keeping all the doors closed. My son even going so far as to allow us to close his door all the way at night! That is new.