Phoenix Journal · Ductwork
A stamped certificate is only worth the competence behind it. Here is how a contractor who genuinely understands your kitchen extract compliance protects your cover - and how one who does not can quietly expose you.
A cautionary tale
The certificate looked perfect. It was framed on the office wall, dated, stamped and signed - and it did not stop the loss adjuster from reducing the claim by tens of thousands of pounds.
Picture a busy grill and wok kitchen running fourteen hours a day. For three years a cleaning firm turned up once a year, degreased the canopy, wiped down the filters and blitzed the first accessible run of ductwork behind the fan. Every visit ended with a glossy report that said "TR19 compliant" across the top. The manager filed it, the insurer took it at face value, and everyone assumed the boxes were ticked.
Then a flare-up on the chargrill drew flame into the extract. It did not stay in the kitchen. It travelled along a horizontal duct run above a suspended ceiling - a stretch that had never once been opened - and did serious damage before the brigade knocked it down. When the loss adjuster arrived, they did not look at the frame on the wall. They asked for grease-deposit readings along the full length of the system, for the position of the access panels, and for photographs of the vertical riser. There were none. The "compliant" paperwork described work that had stopped at the parts you can reach without a ladder and a screwdriver.
Nothing about the visits was fraudulent. The canopy really was clean. The problem was that the contractor did not understand - or did not care - what the standard behind that certificate actually requires. TR19® Grease, the BESA specification that replaced the old Section 7 of TR19 and now treats kitchen extract as a discipline in its own right, is not a badge you earn by cleaning the visible bits. It is a whole-system regime, and this is where it fell down.
The lesson is blunt: a certificate is only worth the competence and honesty behind it. Understanding what "competent person" really means in law is the difference between a document that protects you and one that quietly exposes you.
A contractor who knows your compliance does not talk in vague reassurances. They talk in thresholds, intervals and named duties - because those are the things an insurer, a fire officer or an environmental health inspector will ask about. Here are three that should be second nature to whoever cleans your extract.
Why does the detail matter so much to you rather than just to the technician? Because the duties land on your desk, not theirs. Insurers increasingly make cover conditional on evidence of TR19-compliant cleaning by a recognised provider; some, such as Aviva, will only cover kitchen ventilation cleans carried out by a recognised TR19-compliant contractor. If a fire spreads through poorly maintained ductwork and there is no valid, evidenced certificate, the cover you have paid for can be challenged - exactly as it was in the story above.
You do not need to become a TR19 expert yourself. You need a contractor whose default behaviour makes you compliant without you having to police them. When you are choosing or reviewing one, insist on the following.
The same principle - a contractor who understands the standard that governs the work, and cleans to it rather than around it - applies across the rest of your site. If you run a spray booth, the extraction that carries away solvent fumes and combustion by-products such as carbon dioxide (CO₂) is governed by COSHH and needs local exhaust ventilation testing, not just a wipe-down. The value of one contractor who understands spray booth fumes and compliance alongside your kitchen extract is that nothing falls into the gap between two suppliers, each assuming the other has it covered.
Grease congeals and hardens once the extract cools below roughly 40°C, so the deposits building in the parts you never see are exactly the parts most likely to be skipped by a contractor working to the minimum. Choosing one who works to the standard instead is not an upsell. It is the difference between a certificate that reassures you and one that actually stands up on the day it is tested.
Questions
Not by itself. A certificate is only as good as the work and competence behind it. To stand up to an insurer or fire officer it should be backed by grease-depth readings in microns, before-and-after photographs of the concealed duct runs, and a sign-off from a qualified competent person such as a BESA Grease Hygiene Technician. A certificate that describes only the canopy and the accessible first run does not demonstrate whole-system compliance.
The common guidance is every three months for heavy use of twelve to sixteen hours a day, every six months for moderate use, and every twelve months for light use. However, TR19 Grease expects the real interval to be set by a cleanliness risk assessment that considers your cooking type, hours and how quickly grease builds up. A good contractor sets your frequency from measured deposits, not from habit, and reviews it as your trade changes.
Yes. Many insurers now make cover conditional on evidence of TR19-compliant cleaning by a recognised provider, and some will only cover kitchen ventilation cleans carried out by a recognised TR19-compliant contractor. If a fire spreads through grease-laden ductwork and you cannot produce a valid, evidenced certificate, the claim can be reduced or disputed. Keeping a proper report pack with measurements and photographs is what protects the cover you pay for.
Phoenix Duct Clean · by the numbers
Phoenix surveys and cleans kitchen and building ductwork to the TR19 standard - measured, cleaned and certificated, UK-wide.