Phoenix Journal · Ductwork
A cleaning quote that undercuts every other price in your inbox is rarely the bargain it looks like. Here is how to read one properly before you sign.
Buying kitchen extract cleaning
A cleaning quote that undercuts everyone else in the inbox is not always the bargain it looks like - in commercial kitchen extract work, the cheapest number on the page is usually the one hiding the most.
When three prices land for the same job and one is half the others, the temptation is obvious. Budgets are tight, the canopy looks clean enough from the pass, and a saving is a saving. The trouble is that grease extract cleaning is one of those services where you cannot see most of what you are paying for. The risk lives inside the ductwork, above the ceiling and up on the roof at the fan - places a quick wipe of the visible canopy never touches. A low price almost always means less of that hidden work is being done, and the gap only shows up when your insurer, your fire risk assessor or an environmental health officer starts asking questions.
This is not an argument that dearer is automatically better. It is about learning to read a quote so you can tell a genuinely lean, well-run price from one that has been stripped of the things that actually protect you. Below are the red flags worth pausing on before you sign.
Commercial kitchen extract cleaning in the UK is measured against TR19 Grease, the specification published by the Building Engineering Services Association (BESA). It is the benchmark your insurer and fire risk assessor will expect you to meet, and it sets out exactly what a proper clean involves - the whole system from canopy and filters, through the full length of ductwork, to the extract fan itself. A price that only makes sense if half of that is skipped is not cheaper, it is different work wearing the same name.
Read past the headline figure and check what the wording actually commits to. The common shortcuts are easy to spot once you know the pattern:
None of these omissions show up on the invoice. They show up later, which is exactly why they make the price look competitive today.
The numbers a real clean is measured against
TR19 Grease turns “is it clean?” into something you can measure, and those measurements are the difference between a job that protects you and one that just looks tidy. A quote that never mentions any of them is quoting for something less than a compliant clean.
Those figures are not decoration. The 50 micron average is the pass mark for a completed clean; the mean across the system should stay under 200 microns between visits, and any single reading over 500 microns means that section needs cleaning again straight away. The frequency banding ties to how hard the kitchen runs - roughly twelve to sixteen hours a day is heavy use and points to a three-monthly clean, six to twelve hours moderate, and lighter use annually. If a cheap quote sets a frequency that suits its price rather than your cooking hours, it is working backwards from the number it wants to charge.
The problem with a hollow clean is that the saving is immediate and the bill is deferred. Grease that is left in the ductwork does not disappear - it bakes, hardens and builds, and it is the fuel that turns a small flare-up on the range into a fire that travels the length of the extract system. This is precisely why insurers treat extract cleaning as a maintenance condition rather than a nicety.
Here is the sequence that catches operators out. A fire starts, or an assessor inspects, and the first thing anyone asks for is evidence of a compliant cleaning regime. If all you can produce is a cheap invoice and a canopy photo, you have no post-clean verification report, no grease readings and no proof the ductwork was ever touched. Insurers will not pay out where there is no evidence a sufficient cleaning regime was in place, and neglecting the system can invalidate cover entirely. The few hundred pounds saved on the quote is set against a claim that does not pay and a system that has to be stripped and cleaned properly anyway.
It is the same false economy that runs through so much of a commercial kitchen. Buying on headline price alone tends to cost more over the life of the thing, whether that is a service contract or the equipment itself - the true cost of cheap kitchen equipment follows exactly the same curve, where the money saved on day one is spent several times over on repairs, downtime and early replacement. A skimped clean also leaves behind more than grease. Warm, damp, greasy ductwork and neglected corners are where other problems take hold, which is how a corner-cutting clean quietly feeds the conditions that let mould gain a foothold in a commercial kitchen long before anyone notices the smell.
Reading a quote well does not mean chasing the highest number. It means checking that the price covers the full system, names the standard, includes access and verification, and comes from an insured, accredited team who hand you a report you could put in front of your insurer without flinching. A fair price for all of that will never be the cheapest line in your inbox - and that is the point.
Questions
Almost always because it covers less of the system. The cheap price typically buys a wipe of the visible canopy and the grease filters, while the ductwork and extract fan - where fire actually spreads - go untouched. It may also leave out access panels, post-clean verification and proper insurance, none of which appear on the invoice but all of which you are paying for elsewhere later.
You should receive a detailed post-clean verification report, not just a certificate. It records before and after photographs and actual grease-depth readings taken with a deposit thickness test or wet film thickness test, measured against the TR19 Grease standard. BESA is clear there is no formal TR19 certificate, so a glossy certificate on its own is a red flag rather than reassurance.
Yes. Insurers generally treat extract cleaning as a maintenance condition of cover, and they will not pay out where there is no evidence that a sufficient, compliant cleaning regime was in place. A cheap invoice with no verification report and no grease readings is not that evidence. Neglecting the system can invalidate your policy entirely, which turns a small saving into a claim that does not pay.
TR19 Grease bands frequency by how hard the kitchen runs. Heavy use of roughly twelve to sixteen hours a day points to a three-monthly clean, moderate use of six to twelve hours to every six months, and lighter use to annually. If a quote sets a frequency that suits its price rather than your cooking hours, it is working backwards from the number it wants to charge.
Phoenix Duct Clean · by the numbers
Phoenix surveys and cleans kitchen and building ductwork to the TR19 standard - measured, cleaned and certificated, UK-wide.