R 408.10643 Doors; general provisions.

Rule 643. (1) A door assembly, including the doorway, frame, door, and necessary hardware, may be used as a component in a means of egress when it conforms to the requirements of this part. As such, the assembly is designated as an exit door. (2) A single leaf of an exit door shall be not less than 28 inches nor more than 48 inches in width. (3) Where a door or gate opens directly on a stairway, a platform shall be provided, and the swing of the door or gate shall not reduce the floor area leading to the stairs to a width less than 20 inches.