Fire-Rated Door Hardware: Latching, Labels, and Self-Closing

The Codes and Standards Behind Fire Doors

• NFPA 80, Standard for Fire Doors and Other Opening Protectives, together with NFPA 1 (Fire Code) and NFPA 101 (Life Safety Code), governs "the installation, inspection, testing and maintenance of fire doors," according to an NFPA technical services engineer writing on NFPA's site. Which edition applies depends on what the jurisdiction has adopted.
• UL 10C is the fire test listing that BHMA cites for locks and latches: in its A156.2-2022 summary, BHMA says hardware for fire doors "is evaluated and listed to UL 10C by an accredited third-party testing laboratory."
• UL 305 covers panic hardware. BHMA's A156.3 exit device summary says BHMA certification "includes compliance with UL 305 for Panic Devices."

Ratings and Labels

The NFPA explains that "the required fire protection rating of a fire door is dependent on the rating of the fire-rated assembly that it is installed in." Code tables, such as NFPA 101 Table 8.3.3.2.2, set the needed rating for the opening, subject to any footnotes or modifications.

Labels are how that rating is proven. Per the NFPA blog, NFPA 101 and NFPA 80 require fire doors, fire door frames, and fire door windows to carry a label showing that the component has been tested and listed by an organization acceptable to the AHJ. The label must contain:

• the manufacturer's name
• the mark of the third-party certification agency
• the rating of the component
• the fire test standard designation
• the temperature rise from the listing test at 30 minutes, if less than 650°F (361°C)

Labels must stay legible, and NFPA says they "should not be removed, defaced, or made illegible while the door is in service." If a label on an existing door is missing or illegible, the rating can be verified by other means acceptable to the AHJ.

Hardware listings interact with the assembly. Von Duprin's fire exit device catalog notes that "the opening will carry the fire listing (# hours and opening size) of the least rated component," and tells users to "check with door manufacturers to confirm listing compatibility."

Latching

NFPA states that "fire doors must always be operable," and that operability "includes opening, closing, and latching." Fire doors "must be kept closed and latched or arranged to be automatic closing during the time of a fire." The annual operational test checks that the assembly "will close and latch under fire conditions."

In hardware terms, this is called positive latching. An NIH technical bulletin uses the phrase when describing hardware that provides "positive latching during a fire alarm." Allegion's code consultant Lori Greene describes the requirement as an "active latchbolt to keep the door latched under pressure created by a fire."

Specific latch requirements, such as minimum latch throw and which auxiliary locks may be added, depend on the listings for the door and hardware and on the NFPA 80 edition in force. Check the labels and listings, and ask the AHJ. See latches and strike plates.

Fire Exit Hardware

When panic hardware is used on a fire door, it must be fire exit hardware. Von Duprin explains that to carry the UL label for fire exit hardware, a device must first meet the requirements for panic hardware. It must then pass a burn test to prove "that it can hold fire doors closed," followed by a hose-stream test. I Dig Hardware describes the same dual listing as panic (UL 305) plus fire (UL 10C / NFPA 252).

On pairs of doors, Von Duprin's listing notes allow fire-rated flush bolts on one leaf in some configurations. For less-bottom-rod devices, a top flush bolt with an auxiliary fire bolt may be substituted, as the specific listing allows.

Electrified Hardware on Fire Doors

Access control and fire doors can coexist when the fire-door rules are respected:

• Electric strikes: the NIH bulletin states that "for electric strikes on fire-rated doors, fail secure strikes must be used, per NFPA 80." I Dig Hardware notes that fail-safe electric strikes are not listed for fire doors.
• Electric latch retraction on panic or fire exit hardware is fail-secure by nature. The NIH says such devices can be used on fire doors "to allow push/pull function during normal use and provide positive latching during a fire alarm," with a fire alarm signal to the power supply.

Closing the Door

A fire door that stays open does not protect anything. NFPA's rule is that fire doors are kept closed and latched or are automatic-closing, and "blocking or wedging doors in the open position is prohibited."

• Self-closing: a door closer returns the door after each use.
• Automatic-closing: the door may be held open in normal use but must close on a fire signal. LCN describes combination closer/holders "designed to hold the door in the open position under normal usage and to release and automatically close the door under fire conditions."

Inspection and Everyday Care

The NFPA blog says NFPA 80 requires fire doors to be "inspected and tested immediately after the initial installation and then at a minimum annually after that" (NFPA 80-2025 §5.2.4). The inspection must be done by a qualified person whose credentials are acceptable to the AHJ. NFPA 80 lists 13 items to verify, including:

• legible labels
• damage
• broken or missing parts
• clearances around the door
• compliant signage
• an operational close-and-latch test

Signage is limited too. The NFPA blog notes that combustible signs may not exceed 5 percent of the door face, and signs may not be installed on glazing or interfere with operation. Other details, such as hinges, protection plates, and gasketing, are covered by NFPA 80 and the listings, and vary by edition.

Related Topics

• Panic hardware: exit devices and their history
• Electric strikes: fail-secure versus fail-safe
• Electromagnetic locks: magnetic holding and release
• Mortise locks: lock bodies used on many rated doors
• ANSI/BHMA lock grades: performance standards for locks
• Door closers
• Strike plates

Sources