Fire doors: self closing, latching and what actually voids the label
A door that closes but does not latch has lost its rating. Not every hole drilled on site has, and the listing laboratory is who decides.
A fire door only does its job closed and latched. NFPA 80 Chapter 5 covers how the door behaves, what can be done to it on site, and how often it is inspected. The most common errors run in both directions: missing a door that no longer latches, and writing up a door for hardware that was perfectly allowed.
Closes and latches by itself
A fire door closes and latches by itself from any open position (NFPA 80 Chapter 5). A door that closes but does not latch does not hold the rating.
From the field
Release it from fully open and watch it latch. Do not push it.
Holding it open
A fire door may be held open only by a listed device that releases on alarm (NFPA 80 Chapter 5, NFPA 72 Chapter 21). Wedges, hooks and tied back closers are not that.
Field modifications: what voids the label
The inspection item is that no field modifications have been made that void the label, which is not the same as no field modifications at all. Modifications are permitted with written authorization from the listing laboratory, and where the manufacturer no longer exists the laboratory can provide an engineering evaluation instead.
| Permitted as job site preparation | Needs the listing laboratory |
|---|---|
| Holes for surface applied hardware, generally up to 1 in. diameter | Any other modification that could void the label |
| Function holes for mortise locks | Work on a door whose manufacturer no longer exists (engineering evaluation) |
| Holes for labeled viewers | - |
| Undercutting a wood or composite door by up to 3/4 in. | - |
| Protection plates, including kick plates | - |
From the field
Look for filled holes, aftermarket hardware, and a label that has been painted over or removed. Then ask whether the work was authorized, rather than assuming it was not.
The gap under the door
Clearance under the bottom of a door is no more than 3/4 in., measured vertically from the bottom of the door to the top of the finished floor or threshold. Where latching hardware projects from the bottom, the hardware manufacturer instructions govern but still cannot exceed 3/4 in. Where a threshold is fitted, the hardware manufacturer instructions and listing govern. Perimeter and meeting edge clearances are set separately.
Products listed for use at or under the bottom of a fire door may leave a larger gap when installed to their listing, so a bigger gap is not automatically a finding.
Annual inspection and the records
Fire doors are inspected and tested at least annually, and the periodic procedure includes everything required for the acceptance test as a minimum (NFPA 80 Chapter 5). Rolling steel fire doors are drop tested twice: once for operation and full closure, and again to confirm the automatic closing device has reset correctly. Doors covered by NFPA 80 Chapters 11 and 13 are inspected by a trained rolling steel fire door systems technician.
| Record | Kept for |
|---|---|
| Acceptance test | The life of the assembly |
| Periodic inspection and test | At least 3 years |
Keep reading
Waterflow and supervisory signals from the sprinkler system
The 90 seconds is the device, not the horns. What the waterflow and supervisory devices have to do, and how many go on one circuit.
Smoke detector sensitivity testing: measured, not sprayed
Canned smoke proves a detector responds. It does not prove it is in calibration. Here is the schedule, and how the longer interval is earned and lost.
Manual pull stations: placement, height and travel distance
Measure to the handle, put one by every exit, then walk the floor to check nobody is more than 200 feet from one.
Strobe mounting height and candela: how NFPA 72 sizes visible notification
Measure the lens, size the room correctly, and never drop a strobe below 80 inches without redoing the coverage.
Keeping the way out usable: egress doors, locks and obstructions
A clear corridor is not signed off once. One motion to open, doors that unlock before the horns, and the delayed egress condition most often broken.
Changed the system? What NFPA 72 says you retest
One added horn is a one device test. One added horn plus a programming change is not. How the scope of reacceptance follows what changed.