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Extraction cleaning - compliance
The canopy is the part everyone can see, so it is the part that gets cleaned - and the part a cut-price contractor stops at. But the compliance, and the fire risk, live in the ductwork behind it.
The short answer
Cleaning the canopy and filters makes the visible part of your extraction look spotless, but it leaves the concealed ductwork and the extract fan - where combustible grease actually accumulates and where a fire travels - untouched. TR19 Grease is a whole-system standard, so a canopy-only clean, however bright the result, does not make you compliant and does not control the fire risk.
The illusion
The canopy over the cookline is the face of a kitchen extract system - stainless, visible, and the thing people judge cleanliness by. Wipe it and the filters down and the kitchen looks cared for, which is exactly why a canopy-only clean is so easy to mistake for a proper one. The visible result is convincing.
But the canopy is only the entrance to the system. Behind and above it, the grease-laden air travels through concealed ductwork, up risers, and out through the extract fan - none of which a canopy clean touches. The shine at the front tells you nothing about the state of the run behind it, which is where the compliance and the danger actually are.
Where the risk really sits
The grease that sets the fire risk is the grease you cannot see. It lines the inside of the horizontal duct runs above ceilings, coats the vertical risers between floors, and builds on the blades of the extract fan. That is where a flare-up on the cookline finds fuel and a concealed route to travel through the building - which is precisely why the standard is concerned with the whole run, not the canopy.
A canopy-only clean leaves all of that in place. The most dangerous, most combustible part of the system is untouched, hidden from view, and quietly accumulating. The kitchen looks safer after the clean while being no safer at all where it counts.
Why it fails compliance
TR19 Grease treats the extract system as one thing, from the point of capture at the canopy to the point of discharge at the fan, and expects the whole of it cleaned and measured. A clean that covers only the canopy and filters, by definition, does not meet a standard that requires the concealed ductwork and fan cleaned to a measured level. It is not a smaller version of compliance - it is not compliance.
This also shows up in the paperwork. A proper clean produces a certificate with grease readings taken across the system and honest notes on what was reached; a canopy-only clean cannot produce that for the parts it never touched. A certificate that implies whole-system compliance off the back of a canopy wipe is exactly the gap an insurer or assessor looks for.
How it catches people out
This is often where a suspiciously cheap extract quote comes from. Cleaning a canopy and filters is quick and easy; cleaning the full concealed ductwork, risers and fan takes far longer, needs access and produces the measurements. A canopy-only clean priced and presented as a full clean looks like a bargain and is really a different, lesser job.
Operators get caught because the two look identical from the front - a gleaming canopy either way. The difference only becomes visible when someone opens the ductwork, or when a fire starts in a section that was never cleaned. Asking what proportion of the system will be reached and measured is how you tell the full clean from the canopy wipe before you buy it.
What compliant looks like
A genuinely TR19-compliant clean reaches the whole system: the canopy and filters, the concealed horizontal and vertical ductwork, the plenum and the extract fan - cleaned and measured with grease readings before and after, access panels fitted where the run is sealed, and the result recorded honestly on a certificate. The canopy is part of that, not the whole of it.
So the test of a clean is not how the canopy looks afterwards but how much of the system was reached and proven. Insist on the whole run, insist on the readings, and the shine at the front is backed by real compliance behind it - which is the only version that controls the fire risk and satisfies the standard.
Questions
No. TR19 Grease is a whole-system standard covering the concealed ductwork, risers and extract fan as well as the canopy. A canopy-only clean, however bright, leaves the fire risk in place and does not meet the standard.
In the parts you cannot see - the horizontal duct runs above ceilings, the vertical risers, and the extract fan. That is where combustible grease accumulates and where a fire can travel through the building.
Because the canopy is the visible face of the system, and a clean one convinces. The state of the concealed ductwork behind it is invisible, so the two look identical from the front.
Because it is a smaller job. Cleaning the full ductwork, risers and fan takes longer, needs access and produces measurements. A canopy wipe priced as a full clean is a different, lesser job.
Ask what proportion of the system will be reached and measured, and check the certificate records grease readings across the system with honest access notes - not just a bright canopy.
The whole system - canopy, filters, concealed ductwork, risers, plenum and extract fan - cleaned and measured with before-and-after readings, access panels fitted where needed, and the result certificated honestly.
We clean canopy to fan and measure and certificate it, so what looks clean at the front is compliant behind.
