A fire door frame must have wither an attached or embossed label.
A fire door must be self latching.
A fire door must be self closing.
If a fire door is held open, it must be equipped with a listed heat responsive device, fusible link or a smoke detection device.
A fire door must be free of any obstructions which could prevent the door from operating properly, i.e. wedge door stops, chains, hook backs, etc.
Only listed fire door hardware shall be used.
A fire door must have steel bearing-type hinges. (Exception: Non-bearing plain steel hinges may be used if they are part of a listen assembly.)
Door swinging in pairs that require astragals shall have at least one over lapping astragal. Pairs of doors within a means of egress shall not be equipped with an astragal that inhibits the free use of either leaf. A coordinator or open-back strike should be used to ensure proper closing.
Fire doors with glass lights:
The glass frame and glazing bead must be metal.
The glass must be labeled wire glass not less the 1/4” thick or as permitted by the labeling agency.
[Reference: Steel Door Institute (http://www.steeldoor.org)