Years ago, I read a rule of thumb for fire safety in tall buildings. Basically, it said staying anywhere above the 7th floor, people were far less likely to make it out. This was partly due to the limits of fire fighting equipment. The other consideration was how long it takes to get down the stairs from the upper floors. It takes a long time during a drill when conditions are good, so we can imagine how difficult it becomes when affected by smoke and heat.
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