What structural header is required above a two-hour fire damper located within a two-hour fire rated USG Cavity Shaft Wall system?

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What structural header is required above a two-hour fire damper located within a two-hour fire rated USG Cavity Shaft Wall system?

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The design of structural members containing fire damper assemblies is normally the responsibility of the fire damper manufacturer, and not USG. This is for proper operation of the fire damper during a fire.

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