Stair access that has a three-hour fire door or hatch and a smoke-proof and airtight seal, or two sets of fire doors for radiant heat protection.
A special roll cage that is designed to stop debris from blocking the exits
A fire bunker must be made out of appropriate materials. Some options:
- Concrete: Reinforced concrete set into the ground deep enough so as to not be compromised (explode) from intense fire
- Wood: Built underground similar to a basement. Very thick timbers that char rather than burn rapidly, buying you time while the fire front passes
- Prefabricated: Specialized concrete reinforced with steel. Often modular in design and sometimes available as kits. Completely buried or partially exposed.