Safety zone separation distance
n. The minimum distance a firefighter in standard wildland fire personal protective clothing must be separated from flames to prevent radiant heat injury.
Safety zone separation distance is an output computed in the BehavePlus fire modeling system based on the Butler and Cohen (1998) safety zone model; it is the core output of that model. Separation distance is 4 x flame height. Separation distance is calculated to prevent only radiant heat injury; exposure to convective heat is not accounted for in this model.