Phoenix Journal · Extraction
A care home can tick every box on alarms and drills and still fail its fire inspection on one overlooked system - the kitchen extract. Here is exactly how it happened, and how to make sure it never happens to you.
Case postmortem
On paper, the home looked ready. Alarms tested, drills logged, fire doors surveyed, extinguishers in date - and yet the visiting fire safety officer left having served an enforcement notice.
The setting is a mid-sized residential care home with around forty beds and a busy kitchen that runs breakfast, lunch and an evening meal every day of the week. The responsible person - in this case the registered manager - had done what most conscientious managers do. They kept a tidy fire logbook, they had a current fire risk assessment, and they could produce records for the alarm panel, the emergency lighting and the annual door inspections. Staff knew their evacuation roles. By any reasonable measure, this was not a home that took fire safety lightly.
So the enforcement notice came as a shock. It did not turn on the alarm system or the escape routes at all. It turned on a single system almost nobody looks at until something goes wrong - the kitchen extraction ductwork running from the canopy up through the roof void. The officer opened one inspection hatch, ran a finger along the inside of the duct, and the conversation changed completely. What follows is what went wrong, why it counted as a failure in law, and the practical fix that would have prevented it.
The canopy and the visible filters looked clean, because those are the parts the kitchen team wipes down every night. Behind the filters, though, the horizontal and vertical runs of ducting told a different story. Years of frying, grilling and roasting had left a thick, sticky layer of grease coating the internal walls of the extract - the part no cloth ever reaches. In places it had begun to carbonise into a hard, varnish-like crust.
Grease inside a hot extract system is fuel. Around 70% of fires in commercial kitchens are linked to the extract ventilation and the fat and grease that collect inside it, and once a flame reaches a grease-lined duct the fire can travel the full length of the system in seconds, straight into the roof void above sleeping residents. In a care home, where many people cannot self-evacuate quickly, that is close to a worst-case scenario.
Two documentary failures sealed it. First, there was no post-clean verification report to prove the internal ductwork had ever been cleaned to standard. Second, long sections of the duct had no access panels at all, which meant nobody could have inspected or cleaned the interior even if they had wanted to. To the officer, that combination showed the fire risk assessment had never genuinely considered the extract system - a clear gap under the law.
None of this happened through carelessness. It happened because the extract system fell into a blind spot between the people who look after the building and the people who look after fire safety. Unpicking it, four things had quietly gone wrong.
The recognised benchmark here is TR19® Grease, the BESA specification for managing fire risk in kitchen extraction. It is the standard fire officers, insurers and risk assessors point to, and it is unambiguous: grease must be controlled so the internal surfaces do not exceed a mean average of around 200 microns between cleans, heavier spots of 500 microns or more need dealing with promptly, and a proper clean must bring the system back below an average of 50 microns, proven by a deposit or wet film thickness test. The home could not demonstrate a single one of those numbers.
The reassuring part of this story is that the remedy is well defined and entirely achievable. The home lifted the enforcement notice within weeks by working through a clear sequence, and it is the same sequence any care home can follow before an inspector ever knocks.
The wider lesson is that a fire inspection is not really about your paperwork looking neat - it is about being able to prove, on the spot, that every significant risk has been assessed and controlled. The extract system is one of the easiest to overlook and one of the most dangerous to get wrong, particularly in a building full of people who depend on staff to move them to safety. Treat the ductwork as part of your fire strategy rather than part of the plumbing, and it stops being a weakness. If you want a broader checklist for the whole visit, our guide on how to prepare for a fire safety inspection walks through what officers look for room by room. The home in this case now schedules its extract clean and survey like clockwork, keeps the verification report to hand, and has passed every inspection since.
Questions
Yes. Under the Regulatory Reform (Fire Safety) Order 2005 the responsible person must assess and control every significant fire risk, and grease inside the extract ductwork is one of the most serious in any catering kitchen. Fire officers routinely open an inspection hatch and check the internal surfaces, and an uncleaned or unverifiable duct can trigger an enforcement notice on its own - regardless of how good your alarms and escape routes are.
It depends on how many hours a day the kitchen cooks. TR19 Grease guidance puts heavy use of twelve to sixteen hours a day at roughly every three months, moderate use of six to twelve hours at around every six months, and light use at about twelve months. Most care home kitchens serving three meals a day fall into the heavy or moderate band, so quarterly or six-monthly cleaning is common. Your fire risk assessment and insurer may set a more frequent interval.
A post-clean verification report is the document that matters. It should show before-and-after grease thickness readings, dated photographs of the internal ductwork, a labelled system schematic and a sign-off from a qualified technician, confirming the system was brought below an average of 50 microns. Keep it in your fire logbook alongside your alarm and fire door records so you can produce it instantly during an inspection or an insurance claim.
Phoenix Duct Clean · by the numbers
The right kit only helps if the system stays clean. Phoenix degreases canopies, filters and ductwork to TR19 Grease - UK-wide, overnight.