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방화문의 내화 한계의 차이 : 방화문은 방화문의 내화 무결성, 즉 내화 시간 인 A, B, C로 나뉘며 현재 표준은 화재 예방입니다. 시간은 1.5시간 이상, B 등급은 1.0시간 이상, C 등급은 0.6시간 이상입니다.

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