Smoke Barrier or Fire Retardant Walls- Each building shall be divided into

Smoke Barrier or Fire Retardant Walls- Each building shall be divided into areas not exceeding five thousand (5,000) square feet between exterior walls or smoke barrier walls. The barrier walls shall be constructed from floor to roof decking with no openings except in corridors or other areas specifically approved by the licensing agency. Self-closing “B” label fire doors with fusible linkage shall be installed in the barrier walls in corridors. All air spaces in the walls shall be filled with noncombustible material.