A two-hour rated partition abuts a 2 1/2-inch wide perimeter frame and transom. Mineral wool insulation and flexible extruded silicone flashing fill the perimeter joint, backed by a spacer, backer rod, and sealant. A mullion cover cap and door adaptor integrate the 90-minute rated temperature rise door assembly at the stair lobby boundary.
2 1/2" WIDE PERIMETER FRAME AND TRANSOM SPACER MULLION COVER CAP DOOR ADAPTOR 2-HR RATED PARTITION BACKER ROD AND SEALANT MINERAL WOOL INSULATION AND FLEXIBLE EXTRUDED SILICONE FLASHING 90-MIN RATED TEMPERATURE RISE DOOR ASSEMBLY STAIR LOBBY
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