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A solid - tight closure of a concealed space - placed to prevent the spread of fire and smoke through such a space. In a frame wall - this will usually consist of 2 by 4 cross blocking between studs. Work performed to slow the spread of fire and smok

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1. A solid - tight closure of a concealed space - placed to prevent the spread of fire and smoke through such a space. In a frame wall - this will usually consist of 2 by 4 cross blocking between studs. Work performed to slow the spread of fire and smok





 
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