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A continuous, unobstructed path of escape from a building for use in case of fire.

The elapsed time during which a material, assembly, or construction provides resistance against the passage of fire (or excessive heat)

Of a refractory concrete, the compressive or flexural strength determined after the first firing to a specified temperature for a

A fire-endurance rating for doors, shutters, etc., established by the Underwriters Laboratories, Inc., or other recognized and approved laboratory: class

1. A fire-resistive door assembly, including frame and hardware, which is capable of providing a specified degree of fire protection