Fire Safety Science Digital Archive

An expression is derived for the temperature rise of the unexposed surface of a wall subjected to fire conditions on one side, the unexposed face of the fire wall losing heat by Newtonian cooling to the atmosphere. The limitations applying to the expression are discussed and it is shown that the expression is valid provided the temperature rise of the cooler surface is less than about half its equilibrium value. Expressions are derived for the fire resistance time of a wall subjected to a B.S. 476 furnace test.