Phoenix Journal · Ductwork
If your insurer has started asking hard questions about your kitchen extract cleaning certificate, it usually means the paperwork does not prove what it claims. Here is what a defensible certificate looks like and how to fix the gaps.
Compliance & insurance
A cleaning certificate is only worth what it can prove, and insurers have become very good at spotting the ones that prove very little.
It is an uncomfortable moment. You paid for your kitchen extract system to be cleaned, you filed the certificate, and now - often at renewal, or worse, after a claim - your insurer or their loss adjuster is picking it apart. The frustrating part is that the cleaning may well have been done properly. The problem is usually that the document in your file does not stand up on its own as evidence.
Insurers have tightened up for good reason. Grease-laden kitchen extract ductwork is one of the most common ignition and fire-spread paths in commercial premises, and many policies now carry a specific condition or warranty requiring the system to be cleaned to a recognised standard on a set frequency. If a fire is linked to an uncleaned or poorly cleaned system, your right to indemnity can be challenged - which means a claim worth hundreds of thousands of pounds can hinge on a single sheet of paper. So it pays to understand exactly what your insurer is looking for.
The recognised standard in the UK is BESA's TR19 Grease specification, which sits under the fire-risk-management side of ventilation hygiene. A certificate that simply says "cleaned in line with TR19" with a date and a signature is not, on its own, proof of anything. Under TR19 Grease, the certificate is meant to be backed by a Post-Clean Verification Report - the PCVR - and it is the PCVR that insurers, auditors and expert witnesses actually scrutinise.
A defensible PCVR is a record of performance, not a receipt. It should contain, as a minimum:
When any of those elements is missing, the certificate becomes an assertion rather than evidence. The most common reasons a certificate gets questioned are exactly these gaps: no micron readings, no photographs from matching positions, no reference to the applicable standard, or - very often - silence about the parts of the system that were never touched. If the report does not clearly reference the standard, or does not distinguish accessible from inaccessible ductwork, an adjuster can reasonably argue that compliance was never demonstrated.
Access is where a great many certificates quietly fall apart. Kitchen extract ductwork frequently runs above false ceilings, through roof voids and plant rooms, or vertically up external walls. TR19 Grease requires access panels of sufficient number, quality and size to allow the whole internal run to be reached and inspected. If those panels are not there, long sections cannot be cleaned - and a certificate that implies a full clean when only the accessible canopy and the first few metres of duct were done is precisely the sort of document that unravels under examination.
These are the reference points a loss adjuster or fire investigator will hold your paperwork up against. Missing any of them is what turns a routine renewal question into a dispute.
Cleaning frequency is driven by how hard the kitchen works. As a rule of thumb, heavy use of roughly twelve to sixteen hours a day points to cleaning every three months, moderate use of six to twelve hours every six months, and light use of two to six hours every twelve months. If your certificate shows a frequency that does not match how your kitchen actually operates, expect that to be flagged too.
The good news is that a questioned certificate is fixable, and it is far cheaper to fix it now than to argue about it after an incident. Start by checking who did the work. The accreditation UK insurers recognise as proof of compliant TR19 Grease cleaning is BESA's Vent Hygiene Register - the VHR - whose members are audited on their processes and whose PCVRs are subject to ongoing technical surveillance. A certificate from a contractor outside that scheme carries far less weight, however diligent the cleaning was.
Next, read your own PCVR the way an adjuster would. Does it show before-and-after photographs? Does it include deposit thickness readings? Does it name the standard, the technician and the date? Does it say honestly which parts of the system were cleaned and which were not? If the honest answer is that whole runs of ductwork are inaccessible, the fix is usually to have additional access panels fitted so the next clean can be genuinely complete - and documented as such. It is also worth keeping your certificates as part of your fire risk assessment, since the PCVR forms part of the evidence a responsible person is expected to hold under the fire safety regime.
Finally, get ahead of the calendar. A one-off clean that lapses is easy for an insurer to challenge; a planned, evidenced cycle that matches your usage is not. Building your cleaning around a proper ventilation cleaning compliance plan means the frequency, the access and the verification are all decided in advance, so each certificate lands with the corroboration your insurer is asking for. If a specific document has already been challenged, it is worth understanding what a fully defensible extraction cleaning compliance certificate should contain before you respond.
Questions
No. The certificate is a short summary statement, while the Post-Clean Verification Report (PCVR) is the detailed evidence behind it. Under TR19 Grease the PCVR is what carries the before-and-after photographs, the deposit thickness readings and the record of which sections were cleaned. Insurers and loss adjusters treat the PCVR, not the certificate alone, as the proof of compliance.
Usually because the paperwork does not prove the work. Common reasons are missing micron readings, no photographs taken from matching positions, no reference to the TR19 Grease standard, or no clear statement about parts of the system that could not be reached. If the report cannot demonstrate that the whole accessible system was cleaned to the threshold, the certificate is treated as an assertion rather than evidence.
Yes, a great deal. The accreditation UK insurers recognise as proof of compliant TR19 Grease cleaning is BESA's Vent Hygiene Register (VHR). Members are audited on their processes and their verification reports are subject to ongoing surveillance. A certificate from a contractor outside that scheme tends to carry far less weight in a dispute, regardless of how well the cleaning was performed.
Review the report the way an adjuster would and identify the missing elements - photographs, micron readings, the named standard, and an honest account of accessible versus inaccessible ductwork. Where whole runs cannot be reached, having additional access panels fitted lets the next clean be genuinely complete and fully documented. Then move to a planned cleaning cycle matched to your kitchen's usage so future certificates arrive with the corroboration your insurer expects.
Phoenix Duct Clean · by the numbers
Phoenix surveys and cleans kitchen and building ductwork to the TR19 standard - measured, cleaned and certificated, UK-wide.