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603.3.1 Rectangular Ducts
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Supports for rectangular ducts shall be installed on two opposite sides of each duct and shall be riveted, bolted, or metal screwed to each side ...
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Equivalent Galvanized Gage No.
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0.027
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to the central vacuum unit shall be permitted to be used.
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dimensionally from those shown in this table, equivalent diameters shall be permitted to be determined from published tables for square and rectangular ...
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