Fire Door Assemblies: What the Label Lets You Change, and What Voids It
, by United Doors and Locks, 4 min reading time
The label certifies the whole assembly, not the door leaf. What NFPA 80 lets you change in the field, what voids the rating, and the clearances that fail inspections.
A fire door is not a product. It is an assembly — door, frame, hinges, latching hardware, closer, and any glazing — that was tested together and listed as a unit. The label on the door edge certifies the assembly, not the leaf. Which is why changing one component in the field can void a rating that the other components still meet perfectly.
Where the label is and what it says
Look on the hinge edge of the door, usually near the top hinge. There is a second label on the frame, typically on the rabbet behind the hinge. Both must be present and both must be legible.
The label carries the listing agency, the rating in hours or minutes, and often whether the assembly is approved with or without a hose stream test. Ratings run 20 minutes, 45 minutes, 1 hour, 1-1/2 hours, and 3 hours.
Painting over a label voids it. Not figuratively — an inspector who cannot read the label has an unlabelled door, and an unlabelled door in a rated opening fails the inspection. This is one of the most common findings in a fire door survey and one of the easiest to avoid: mask the labels before the painters arrive.
The two things a fire door must always do
Self-close from any position. A closer or spring hinge must shut the door from any angle it can be opened to, unaided.
Latch positively. The latch must engage the strike every time. A door resting closed but unlatched will be pushed open by the pressure a fire generates. This is why fire exit hardware cannot have mechanical dogging and why a closer on a fire door must never be turned down to the point where the door stops latching.
Every other rule follows from these two.
What you may change
Job-site preparation is permitted within limits set by NFPA 80:
- Holes for hardware, where each hole is not more than 1 inch in diameter, excluding cylinder preparation.
- Replacing hardware like for like with a listed component of the same type — a failed closer swapped for an equivalent listed closer.
- Protection plates, provided the top of the plate is no more than 16 inches above the bottom of the door. Above 16 inches the plate must be specifically listed for the application.
- Adding a listed kit — vision lite kits, louvre kits, electrified hardware kits — installed strictly to the manufacturer's listed instructions.
What voids the label
- Field-cut openings. Cutting a vision lite or a louvre into a labelled door without a listed kit ends the rating immediately.
- Welding or cutting the door or frame. Including welding a repair.
- Unlisted hardware. A closer, lock, or exit device that is not listed for fire door use. A Grade 1 rating is not a fire listing.
- Mechanical dogging on the exit device. The device must latch. Use a fire-rated device such as the F2000V or a fire-rated configuration of the 8300B, not a panic-only device.
- Any hold-open that is not fail-safe. Wedges, hooks, tied-back closer arms, and unlisted hold-open arms. The only compliant hold-open releases on the fire alarm.
- Removing the closer because somebody complained the door was heavy.
- Aluminium or brass hinges. Steel ball bearing hinges, matching the listing.
Clearances, which fail more inspections than hardware
NFPA 80 sets maximum gaps, and doors drift out of tolerance as hinges wear:
| Location | Maximum clearance |
|---|---|
| Head and jambs | 1/8 in |
| Between leaves of a pair | 1/8 in |
| Bottom of door to floor | 3/4 in |
A sagging door opens the gap at the top corner and closes it at the latch edge, so a clearance failure and a latching failure usually arrive together. The underlying cause is normally the hinges — which is the argument for ball bearing hinges such as the H4545 Series, or continuous hinges on the hardest-worked rated openings.
Annual inspection
NFPA 80 requires fire door assemblies to be inspected and tested at least annually, with written records kept. The inspection checks the label, the clearances, the closing and latching, the hardware, and the absence of field modifications and hold-open devices.
The records matter as much as the inspection. An assembly that passes but has no documentation is difficult to defend after an incident.
The realistic failure list
In practice, most rated openings fail on the same handful of items: a painted label, a door held open with a wedge, a closer that no longer latches the door, a kickplate fitted too high, a field-cut vision lite, and clearances gone out of tolerance from worn hinges. None of those requires a new door to correct — they require the right listed part and someone to look at the opening.
If you have a set of rated openings and no idea what state they are in, send us the door and frame label information and we will tell you what can be repaired within the listing and what has to be replaced.