For how long can a Class A bulkhead prevent smoke or flame passage?

A Class A bulkhead is a type of fire-resistance-rated wall used to separate areas within a vessel or building. Its primary function is to prevent the passage of smoke and flames between compartments, thus providing a vital safety feature in fire situations. The standard duration for which a Class A bulkhead can effectively contain smoke and flames is one hour. This one-hour rating allows for sufficient time for occupants to evacuate and for firefighting measures to be implemented.

The one-hour fire-resistance rating signifies that the bulkhead has been tested under specific conditions to ensure that it can withstand the effects of fire, providing a critical barrier and reducing the likelihood of fire spreading to other areas. This containment is essential for life safety and to protect property in the event of a fire onboard.