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MC § 607.3.2.1
Fire dampers shall have the minimum fire protection rating specified in Table 607.3.2.1 for the type of penetration. Table 607.3.2.1Fire Damper Rating Type of Penetration Minimum Damper Rating (hour)Less than 3-hour fire-resistance-rated assemblies1 1/23-hour or greater fire-resistance-rated assemblies3
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