Fire Door Ironmongery and Hardware: The UK Rules

What is fire door ironmongery, and what counts as compliant?

Fire door ironmongery — the trade also calls it fire door hardware or fire door furniture — is the collective name for every item fixed to a fire doorset to make it hang, close, latch, lock and operate. It covers the hinges the leaf swings on, the self-closer that returns it to the frame, the lock and latch, the handles, any hold-open or free-swing device, and add-ons such as letterplates, viewers, kick plates and signage. On an ordinary door these are interchangeable commodities. On a fire door they are not: each item was present, in a specific form, when the doorset passed its fire test, and the certification only describes that combination.

The BWF Fire Door Alliance splits the hardware into two groups. Essential hardware — hinges, the self-closing device, and the lock or latch — is what a fire door needs to function as a fire door at all; it must be present and correctly specified. Non-essential hardware — letterplates, viewers, numerals, kick plates and the like — 'may also be fitted, but they must be correctly installed, in accordance with the door manufacturer's instructions'. The label 'non-essential' is about function, not fire safety: a badly chosen letterplate still puts a hole in a tested barrier. The BWF's underlying rule applies to both groups — a door 'can only work correctly if installed using the same compatible components as when it was tested'.

Hinges: BS EN 1935 and the 800°C rule

A timber fire door is normally hung on a minimum of three metal hinges — more on taller or heavier leaves, exactly as the certificate specifies. Fire door hinges must be CE or UKCA marked and tested to BS EN 1935, the standard for single-axis hinges, and graded 1 for fire/smoke-door suitability (grade 0 is not suitable). Fire doors are heavy, so a heavy-duty overall grade is usual.

The material rule comes from Approved Document B, Appendix C, paragraph C10: unless the hinge was shown satisfactory when tested as part of the doorset, its essential components must be made entirely from materials with a minimum melting point of 800°C. That keeps the load-bearing parts intact so the leaf stays hung while the fire burns — which rules out aluminium and zinc-based die-cast alloys unless the exact hinge was fire-tested in that doorset. Our dedicated guide to fire door hinges covers hinge numbers, grades, intumescent pads and common inspection faults in full.

Door closers and hold-open devices: BS EN 1154 and BS EN 1155

Most fire doors that people use day to day must close by themselves. The self-closer is essential hardware, specified to BS EN 1154, the product standard for controlled door closing devices. Its classification includes a power size and a fire-behaviour grade; for fire doors the closer should be at least power size 3 and fire-behaviour grade 1. Sizes 1 and 2 do not generate enough closing force to drive a fire door past its seals and throw the latch, so they are not considered suitable for fire or smoke doors.

A correctly set closer shuts the door fully into the frame from any angle, including from around 15 degrees — the functional test used in the government's Regulation 10 fire door guidance. Our guide to fire door self-closers covers power sizes, adjustment and the closer troubleshooting that inspections most often need.

Holding a fire door open lawfully

A wedge is never a lawful way to hold a fire door open. The compliant route is an electrically powered device to BS EN 1155 — an electromagnetic hold-open unit, an alarm-linked retainer, or a free-swing closer — that lets the door stand open or swing freely in normal use and then releases and closes it automatically when the fire alarm operates or power fails. BS EN 1154 only permits a hold-open function on a fire door closer where it complies with BS EN 1155. Without a working fire detection and alarm system to trigger it, the door must simply self-close.

Locks, latches and escape hardware: BS EN 12209, 1125 and 179

The lock or latch is the third piece of essential hardware. Mechanically operated locks and latches are specified to BS EN 12209. On a fire door the point that matters most is not the lock's security rating but its aperture: a mortice lock or latch cuts a deep pocket into the leaf edge, so the lockcase must be a type the doorset was tested with, fitted in the tested position, and — where the certificate calls for it — wrapped in intumescent protection (see below). A sashlock swapped for a deeper or wider case, or a tubular latch fitted where the test used a mortice case, takes the door outside its evidence.

Doors on escape routes carry an extra duty: people must be able to get out without a key, in the direction of escape. Two harmonised standards provide that, and both carry CE or UKCA marking:

Panic hardware to BS EN 1125 uses a horizontal push bar and is intended for escape routes used by members of the public who may be unfamiliar with the building; emergency exit hardware to BS EN 179 uses a lever handle or push pad and is intended where occupants know the building and are unlikely to panic. Which one applies is a fire-strategy decision, not a free choice. Lever handles and knob furniture themselves are specified to BS EN 1906. Whatever the locking arrangement, it must never stop the door being opened for escape, and — like every other item — it must fall within the doorset's tested scope.

Intumescent protection to fire door hardware

Every recess and mortice cut for ironmongery removes timber from the leaf or frame, and on some doorsets the fire test showed those pockets needed protecting. Where that is the case, the certificate and installation instructions call for intumescent protection to the hardware — thin intumescent pads behind the hinge blades, intumescent liners wrapping the lock and latch cases in the mortice, and sometimes protection around the closer body or spindle. In a fire the intumescent expands to fill the void the ironmongery would otherwise leave, closing a path that flame and hot gases could exploit.

This works on the same principle as the intumescent strips and smoke seals housed in the door edge, but it is certificate-driven in both directions: fitting intumescent protection where the evidence does not require it, or leaving it out where it does, are both departures from the tested specification. Follow the instructions for that specific doorset rather than a general rule of thumb.

Non-essential hardware: letterplates, viewers, kick plates and signage

Beyond the essential hinges, closer and lock, a fire door often carries non-essential hardware: a letterplate, a door viewer, a numeral, a kick or push plate, an air transfer grille, or the mandatory 'Fire door — keep shut' signage. The BWF allows that these 'may also be fitted', but on the same condition as everything else — they must be 'correctly installed, in accordance with the door manufacturer's instructions' and compatible with the tested doorset.

The riskiest of these is the letterplate, because it is a full aperture cut through the leaf. On a fire door it must be an intumescent, fire-rated letterplate within the doorset's certified scope, and on a smoke-control door it must also restrict cold smoke — our guide to fire door letterplates and letterboxes covers the detail. Vision panels and glazing follow the same aperture logic; a deep-fixing kick plate or an air transfer grille likewise only belongs where the evidence permits. The safe default for any add-on is simple: if the door's paperwork does not cover it, do not cut or fix it on site.

Why hardware must stay within the certified field of application

A fire door is certificated as a complete, tested doorset or assembly — leaf, frame, seals and ironmongery proven together in one furnace test. What the certificate then covers is a field of application: the range of variations the test evidence, plus any extended application assessment (BS EN 15269-3 for hinged and pivoted timber and composite doorsets), allows without retesting. Hardware sits inside that field. Change an item for one of a different type, size, material or fixing that the field of application does not cover, and the installed door is no longer the door the certificate describes — its fire performance is unproven and the certification can be invalidated.

A fire door's rating — FD30, FD60 and so on — chiefly describes integrity (the 'E' criterion): how long the doorset holds back flame and hot gases. Some doorsets are additionally tested for insulation (the 'I' criterion, giving EI), limiting heat passing to the unexposed face. The ironmongery is only proven for the rating and the criteria the specific doorset was tested to carry — see fire door ratings explained. This is why 'like-for-like' is the safe watchword: replacing a worn item with the identical part the manufacturer specified, using their fixings, keeps you inside the field of application; reaching for a superficially similar product from a merchant's shelf does not.

To check that a door's ironmongery is compliant, work from the evidence, not appearances: find the certification label or plug, trace it to the doorset's certificate and hardware schedule, and confirm each fitted item against it. The certification scheme and CE/UKCA marking tell you how the door and its harmonised hardware were assessed. Where hardware needs changing, use a competent installer working to the doorset's schedule of tested hardware.

Common ironmongery faults found on fire door inspections

Ironmongery is one of the most frequent sources of avoidable fire door failures, and most faults are visible without tools during a fire door inspection or the routine Regulation 10 checks on communal and flat entrance doors in taller residential buildings in England.

The remedy is almost always the same: go back to the doorset's certificate and its schedule of tested hardware, replace with the specified part and the supplied fixings, and record what was done. Where an ironmongery fault sits alongside others — damaged seals, oversized gaps, a failed closer — treat the door as a whole rather than patching one component.