Fire Protection
1-7/8-inch door insulation · Palusol expanding fire seal · 1/2-inch more than Standard and Clamshell models
The 1878 carries 1-7/8 inches of door insulation, compared to 1-3/8 inches on the Standard and Clamshell models. That additional half-inch is meaningful at the door level, particularly for vault rooms in wildfire-exposed communities where the fire scenario may involve sustained heat at the structure rather than a contained house fire. The Palusol heat-activated expanding fire seal closes the gap between the door and frame as temperature rises, preventing heat ingress at the perimeter. Browning vault doors do not carry a minute-based fire rating equivalent to a residential safe. Fire resistance at the door level depends on this insulation and seal system working as designed. The vault room's overall fire protection depends on every boundary surface, not the door alone. How vault door insulation depth translates to real-world fire resistance.