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BC § 722.3.5
The fire-resistance rating of concrete masonry columns shall be determined based upon the least plan dimension of the column in accordance with Table 722.3.5 or by approved alternate methods. Table 722.3.5Minimum Dimension of Concrete Masonry Columns (inches) Fire-Resistance Rating (hours) 1 2 3 4 8 inches10 inches12 inches14 inches For SI: 1 inch = 25.4 mm.
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