What is a class a bulkhead on a ship?

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A class A bulkhead on a ship is:
A wall, floor, or ceiling which is designed to prevent smoke and flame from passing through it for at least 60 minutes.
Also it must be suitably insulated so that the average temperature of the side not exposed to fire does not rise more than 139 degrees C (282 degrees F) above the original temperature, within 60 minutes.

Simply put, no smoke or fire can pass through it for at least 60 minutes, and it must be able to prevent a substantial transfer of heat through it for 60 minutes.
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