46 CFR 131.899 - Fire dampers.

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§ 131.899 Fire dampers.
Each fire damper installed within the boundary of a space protected by a fixed fire extinguishing system must be fitted with an indicator showing whether the damper is open or closed and must be marked with red letters at least 13 millimeters (1/2-inch) high stating “FIRE DAMPER” and, as otherwise appropriate, identifying the space served by the fire damper.

Title 46 published on 2013-10-01

no entries appear in the Federal Register after this date.

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United States Code
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Executive Order ... 12234