TR19 & standards
Two invoices can say 'duct cleaned' and mean completely different things. The gap is accreditation, measurement and proof.
The short answer
A generic duct clean removes what a cleaner can reach and hands you an invoice. A BESA TR19 Grease clean is carried out by a qualified technician, reaches the whole system, measures the grease down to a set limit, and is certified on BESA's record. They can look similar on the day - but only one of them proves compliance and protects your insurance.
What generic really means
A non-accredited clean can be perfectly well-intentioned and still fall short of the standard. Typically it means the visible and easily reachable sections get cleaned, there is no micron measurement, no before-and-after readings, and no independent certificate - just a visual finish and a bill. If sections are hard to reach, they may simply be skipped, unrecorded.
The problem is not always dirt left behind; it is the absence of proof. Without readings and registration you cannot demonstrate to a fire risk assessor or insurer that the system was cleaned to any defined level. On the day it may look identical to a compliant job - which is exactly why the difference is so easy to miss until it matters.
What accreditation adds
A BESA TR19 Grease clean is defined by three things a generic clean lacks. First, competence: the technician holds the BESA Grease Hygiene Technician qualification and the contractor is on the BESCA Ventilation Hygiene Elite scheme or the Vent Hygiene Register, which are independently audited. Second, measurement: grease thickness is read with the DTT or WFTT methods and the cleaned surface is proven down near or under 50 microns. Third, a record: the clean is registered and certified on BESA's Elite database.
Those additions are also why the specification is clear that a business must use an accredited service provider to be TR19 compliant. It is not snobbery about qualifications - it is that compliance is a measured, recorded outcome, and only an accredited route produces the measurement and the record.
The limit
The difference stays invisible right up until an audit or a fire. Then the question is not whether the ducts looked clean but whether you can prove they were cleaned to standard - and a generic clean has no answer. Buildings and contents cover can be treated as invalid where a commercial kitchen can't show a TR19-approved cleaning schedule. Paying a little less for an unaccredited clean can cost a great deal more at the moment you need the paperwork to exist.
Questions
A TR19 Grease clean is done by a qualified technician, reaches the whole system, measures grease to under 50 microns and is certified on BESA's record. A generic clean removes reachable dirt and issues an invoice, with no measurement or certification.
Not on its own. The specification requires an accredited provider, measured verification and registration. Without those, the clean isn't demonstrably compliant even if the ducts look clean.
Check they are on the BESCA Ventilation Hygiene Elite scheme or the Vent Hygiene Register and that their technicians hold the BESA Grease Hygiene Technician (GHT) qualification. You can verify membership through BESA.
Yes. Compliance is about proof, not appearance. A clean with no readings or certificate can't be evidenced to an insurer or fire authority, however good it looks.
It can. Insurers commonly expect evidence of a TR19-approved cleaning schedule, and cover can be treated as invalid without it. The accredited route is what produces that evidence.
Phoenix Duct Clean · by the numbers
We clean to TR19 Grease with qualified technicians, measured results and a registered certificate - not a wipe and an invoice. Ask us what compliance really looks like.