Home / Kitchen Deep Cleaning / Guide
Kitchen deep cleaning - fire safety
A fire door holds back fire and smoke, buying time for people to escape and limiting the spread - but only if it actually works. In hospitality, inspectors repeatedly find the same fire-door failures: doors propped or wedged open, gaps too wide, damaged or missing seals, and self-closers that do not close the door. Here are the fire-door failures inspectors find, and why they matter.
The short answer
A fire door is a door built and rated to resist fire and smoke for a period, so that when it is closed it holds fire and smoke back - protecting escape routes, compartmenting the building, and buying time for people to get out and for the fire to be tackled. But a fire door only does this if it is closed and in sound working order: a fire door that is open, or damaged, or not sealing, does not hold anything back. In hospitality premises, inspectors repeatedly find the same failures that stop fire doors working. The most common is doors propped or wedged open - held open with a wedge, a bin, an extinguisher or anything else - which completely defeats the door, because a fire door that is open cannot hold back fire or smoke. Gaps that are too wide or uneven are another: fire doors work to small tolerances (typically around 3 to 4mm), and gaps wider than that let smoke pass and undermine the door's performance. Damaged, missing or painted-over seals are a frequent finding: the intumescent strip (which expands under heat to seal the gap between door and frame) and the smoke seal (which blocks cold smoke) are essential to the door working, and if they are damaged, missing or painted over they cannot do their job. Self-closing devices that stall are another: a fire door needs to close and latch by itself, so a self-closer that fails to shut the door fully, or leaves it unlatched, means the door is not properly closed when it needs to be. Other findings include wrong or missing hinge screws, damaged glazing, and missing or incorrect signage. What all these have in common is that they stop the fire door doing its job - holding back fire and smoke - so a fire door with any of them is compromised. The reason they matter is that fire doors are a key part of a building's fire protection, and one that fails silently: it looks like a door and works as a door day to day, so a failure is easy to miss until a fire, when it is too late. So keeping fire doors working - closed, sound, sealed and self-closing - is essential, and the common failures are exactly what to watch for and fix.
Key points
What a fire door does
To understand why the failures matter, it helps to be clear on what a fire door does. A fire door is designed and rated to resist fire and smoke for a period of time - it is a specific type of door, built to a standard, that when closed holds fire and smoke back. This does several things in a fire: it protects escape routes (keeping corridors and stairs usable for people to get out), it compartments the building (containing fire and smoke in one area rather than letting them spread), and it buys time - for people to escape and for the fire to be dealt with. Smoke is a particular concern, because smoke spreads fast and is a major cause of harm in fires, so a fire door's ability to hold back smoke (as well as flame) is central to its value.
The crucial thing is that a fire door only provides this protection if it is closed and in sound working order. A fire door standing open holds back nothing - fire and smoke pass straight through the opening. A fire door with a gap too wide, or damaged seals, lets smoke through even when closed. A fire door whose self-closer does not shut it will not be closed when the fire comes. So the whole value of a fire door depends on it being closed (or able to close automatically) and intact - sound, sealed, self-closing. This is why the common failures are so serious: each one stops the door being properly closed or properly sealed, and so defeats the protection the door is there to provide. A fire door that does not work is not a minor defect - it is the loss of a key line of fire protection, often on an escape route where it matters most.
Propped open
The single most common fire-door failure inspectors find is doors propped or wedged open. Fire doors are frequently held open for convenience - with a wedge, a fire extinguisher, a bin, a chair, or anything to hand - because a self-closing fire door is inconvenient when people are moving through it, carrying things, or wanting airflow. In a busy hospitality setting, the temptation to prop a fire door open is strong and constant. But a propped-open fire door is completely defeated: when a fire happens, the door is open, so it holds back neither fire nor smoke, and the protection it should provide is simply gone. Because fires are not scheduled, a door propped open at any time is a door that may be open when a fire starts - so propping is not a small or temporary compromise but a live removal of the protection.
This is why propping fire doors open is such a serious and heavily flagged failure: it is common, it is easy to do, and it entirely negates the door. The fix is straightforward in principle - keep fire doors closed, and do not prop or wedge them open - but it requires discipline and, often, addressing why they get propped. If a fire door needs to be held open for legitimate operational reasons (movement, airflow), the correct solution is a proper hold-open device linked to the fire alarm, which releases the door to close automatically when the alarm sounds - not a wedge. So the answer to the propping problem is either the discipline to keep doors closed, or a proper alarm-linked hold-open system where holding open is genuinely needed - never an informal prop. Inspectors find propped fire doors constantly because the operational temptation is constant; countering it takes ongoing attention, because a fire door propped open is a fire door that does nothing.
Gaps and seals
Two closely related failures concern the gaps around the door and the seals that manage them. Fire doors work to small tolerances - the gap between the door and its frame is typically meant to be around 3 to 4mm - because the door and frame have to fit closely for the door to resist fire and smoke. Inspectors regularly find gaps that are too wide or uneven, from doors that have dropped, warped, been badly hung, or been altered. A gap that is too wide lets smoke pass through even when the door is closed, and undermines the door's fire performance, so an excessive or uneven gap is a real defect even though the door closes. The precise tolerances are part of why fire doors are a specialist matter - they are not just heavy doors but engineered assemblies that have to fit correctly.
The seals are what manage the gap under fire, and damaged, missing or painted-over seals are a very common finding. The intumescent strip, usually set into the edge of the door or frame, expands when heated to close the gap between door and frame - sealing against fire as the door heats up. The smoke seal (a brush or blade seal) blocks the passage of cold smoke in the early stages of a fire, before the intumescent activates. Both are essential to the door working. If they are damaged, missing, or painted over (paint can stop an intumescent strip expanding and clog a smoke seal), they cannot do their job, so the door will not seal properly in a fire even if it is closed. Inspectors frequently record seals that have been damaged, removed, or painted over during redecoration. So the gaps and the seals together determine whether a closed fire door actually seals - and both are common points of failure that leave a door looking fine but not performing. Keeping the gaps correct and the seals intact is part of keeping a fire door working.
Closers and the rest
A fire door generally needs to close and latch by itself, because a door that relies on someone remembering to close it will sometimes be left open - so fire doors are fitted with self-closing devices that shut them automatically. A very common failure is self-closers that stall or fail to fully close and latch the door: the closer is worn, out of adjustment, or obstructed, so the door drifts shut but does not latch, or stops part-way, leaving it not properly closed. A fire door that does not fully close and latch is not doing its job - it may be pushed open by the pressure of a fire, or simply not be closed when needed. So inspectors regularly find self-closers that do not properly close the door, which is as much a failure as a propped door, just less obvious. Latching matters specifically, because a door that is closed but not latched can be forced open.
Other defects inspectors commonly find include wrong or missing hinge screws (fire doors need the correct type and number of fixings to perform; missing or wrong screws weaken the assembly), damaged glazing or glazing seals (fire-door glazing has to be intact and correctly fitted), and missing or incorrect signage (fire doors should be identified, and marked to be kept shut or, if held open, to be closed - so that people know not to compromise them). Damage to the door itself - holes, cut-outs for cables or fittings, or a door replaced with one that is not fire-rated - also defeats it. What all these share with the propping, the gaps and the seals is that they stop the door assembly performing as the rated fire door it is meant to be. A fire door is a complete assembly - door, frame, seals, closer, hinges, glazing, signage - and a failure in any part can compromise the whole. So keeping fire doors working means keeping the whole assembly sound, not just the door leaf. This is why fire-door inspection checks all these elements, and why the common failures span the whole assembly.
Why it matters
The reason all this matters so much is that fire doors are a key part of a building's passive fire protection, and one that fails silently. A fire door that is propped open, gapped, unsealed or not closing looks and works like a door in normal use - it opens, it closes, people pass through it - so the failure is invisible day to day. It only reveals itself in a fire, when the door is needed to hold back fire and smoke and cannot - by which point it is too late to fix. So fire-door failures are dangerous precisely because they are hidden: nothing in normal use shows that the protection has been lost. This is why the failures inspectors find are worth taking seriously even though the door seems fine: seeming fine is not the same as working in a fire.
In hospitality, fire doors matter particularly because the premises often have many people, including members of the public unfamiliar with the building, and the fire doors protect the escape routes those people depend on. A failed fire door on an escape route can let smoke into a corridor or stair that people need to use, which can be deadly. So keeping fire doors working - closed and not propped, correctly gapped, properly sealed, self-closing and latching, the whole assembly sound - is an important part of hospitality fire safety, and one that the common failures show is easily let slip. Regular checking of fire doors (against exactly the failures described - propping, gaps, seals, closers, and the rest) catches problems while they can still be fixed. This sits within the wider fire-safety duties on the premises: fire doors are one of the general fire precautions the responsible person must maintain, alongside detection, alarms, escape routes and the rest. So the failures inspectors find are a checklist of what to keep an eye on - and keeping fire doors working is keeping a key, silent line of fire protection in place for the people in the building.
Questions
Doors propped or wedged open. Fire doors are frequently held open for convenience - with a wedge, an extinguisher, a bin or anything to hand - because a self-closing fire door is inconvenient when people are moving through it. But a propped-open fire door is completely defeated: in a fire the door is open, so it holds back neither fire nor smoke, and its protection is gone. Because fires are not scheduled, a door propped open at any time may be open when a fire starts, so propping is a live removal of the protection, not a small or temporary compromise. The fix is to keep fire doors closed and never prop them; if a door genuinely needs holding open for operational reasons, the correct solution is a proper hold-open device linked to the fire alarm, which releases the door to close automatically when the alarm sounds - not a wedge.
Because fire doors work to small tolerances - the gap between door and frame is typically meant to be around 3 to 4mm - and a gap that is too wide lets smoke pass through even when the door is closed, undermining the door's fire performance. Inspectors regularly find gaps too wide or uneven, from doors that have dropped, warped, been badly hung or been altered. So an excessive or uneven gap is a real defect even though the door closes, because the door and frame have to fit closely for the door to resist fire and smoke. The gap is managed under fire by the seals - the intumescent strip expands under heat to close it - but that depends on the gap being within tolerance and the seals intact to begin with. So keeping the gaps correct is part of keeping a fire door working; the precise tolerances are part of why fire doors are engineered assemblies, not just heavy doors.
They are the seals that let a closed fire door seal against fire and smoke. The intumescent strip, usually set into the edge of the door or frame, expands when heated to close the gap between door and frame - sealing against fire as the door heats up in a fire. The smoke seal (a brush or blade seal) blocks the passage of cold smoke in the early stages of a fire, before the intumescent activates. Both are essential to the door working. Inspectors frequently find them damaged, missing, or painted over - and a painted-over intumescent strip may not expand properly, while a painted or clogged smoke seal cannot block smoke. So damaged, missing or painted-over seals mean the door will not seal properly in a fire even if it is closed. Keeping the seals intact - not damaged, not removed, not painted over during redecoration - is part of keeping a fire door working.
Because a fire door generally needs to close and latch by itself - a door relying on someone to close it will sometimes be left open, so fire doors have self-closing devices to shut them automatically. A common failure is a self-closer that stalls or fails to fully close and latch the door: worn, out of adjustment or obstructed, so the door drifts shut but does not latch, or stops part-way, leaving it not properly closed. A fire door that does not fully close and latch is not doing its job - it may be pushed open by the pressure of a fire, or simply not be closed when needed. Latching matters specifically, because a closed but unlatched door can be forced open. So a stalled or failing self-closer is as much a failure as a propped door, just less obvious - the door is not reliably closed when a fire comes. Keeping the self-closer working and properly adjusted is essential.
Because fire doors fail silently - a door that is propped, gapped, unsealed or not closing looks and works like a door in normal use (it opens, closes, people pass through), so the failure is invisible day to day. It only reveals itself in a fire, when the door is needed to hold back fire and smoke and cannot - by which point it is too late to fix. So seeming fine is not the same as working in a fire. This is why the failures matter even though the door appears normal. In hospitality it matters particularly because the premises often have many people, including members of the public who do not know the building, and the fire doors protect the escape routes they depend on - a failed fire door can let smoke into a corridor or stair people need to use, which can be deadly. So regular checking of fire doors, against the common failures, catches problems while they can still be fixed, keeping a key silent line of protection in place.
Fire doors are one part of a building's passive fire protection - they hold back fire and smoke, protecting escape routes and compartmenting the building. They sit within the wider fire-safety duties on a premises: the responsible person (or duty holder in Scotland) must maintain the general fire precautions, which include fire doors alongside detection, alarms, escape routes, emergency lighting and the rest. So keeping fire doors working is one of the things a proper fire-safety regime covers, informed by the fire risk assessment. Fire doors work alongside fire prevention too - reducing the chance of a fire starting and limiting its fuel. In a kitchen, a significant part of that is controlling grease, which builds up in extraction and on surfaces and is combustible - a real fire load. So a full approach keeps fire doors sound (a line of protection if fire happens) and keeps the fire risk down (including controlling grease through cleaning) - prevention and protection together.
Fire doors are one line of fire protection; controlling grease is another. In a kitchen, grease is a real fire load, building up in the extraction. Our kitchen deep cleaning and extraction cleaning keep it down. Ask us about reducing your kitchen's fire risk.
