It is a fire rated corridor until one door is left open

The NFPA now requires annual inspections of fire-resistance rated door and frame assemblies. Local Authorities Having Jurisdiction must adopt the new edition for this requirement to take effect. Most jurisdictions in the United States will be adopting the IBC (International Building Code) model code, which references the NFPA 80 2007 edition requirement, as their local codes.

NFPA 80 5.2.4.requires the following items shall be verified, at minimum:

1. No Open Holes or breaks exist in surfaces of either the door or frame.
2. Glazing, vision light frames & glazing beads are intact and securely fastened in place, if so equipped.
3. The door, frame, hinges, hardware, and noncombustible threshold are secured, aligned, and in working order with no visible signs of damage.
4. No parts are missing or broken.
5. Door clearances at the door edge of the door frame, on the pull side of the door, do not exceed clearances listed in 4.8.4 (the clearance under the bottom of the door shall be a maximum of 3/4″) and 6.3.1 (top & edges 1/8″)
6. The self-closing device is operational; that is, the active door completely closes when operated from the full open position.
7. If a coordinator is installed, the inactive leaf closes before the active leaf.
8. Latching hardware operates and secures the door when it is in the closed position.
9. Auxiliary hardware items that interfere or prohibit operation are not installed on the door or frame.
10. No field modifications to the door assembly have been performed that void the label.
11. Gasketing and edge seals, where required, are inspected to verify their presence and integrity.

According to building and fire codes, annual fire door inspections are the responsibility of the building owner. However, as with other mandatory fire inspections, the fire door inspections are often omitted and many facilities are out of compliance. The final say on the acceptance of any inspection requires the approval of the AHJ (Authority Having Jurisdiction).

AND THIS IS WHY..this picture is a fire rated door in a hospital