TR19 Kitchen Extract Cleaning Explained
If you run a commercial kitchen, you have likely been told your extraction system needs a "TR19 clean." Perhaps an insurer requested it, or your ventilation engineer flagged it during maintenance. The request is clear, but what it actually involves can feel like an unknown quantity. This guide explains what TR19 kitchen extract cleaning is, why it matters, and precisely what service you are buying.
What Does TR19 Mean for Your Kitchen?
TR19 is not a law or an accreditation. It is a technical standard published by the Building Engineering Services Association (BESA). Formally titled Guide to Good Practice – Internal Cleanliness of Ventilation Systems, TR19 sets the benchmark for how ventilation ductwork should be cleaned and, crucially, how the results should be measured.
The standard exists because commercial kitchen extraction systems accumulate grease and cooking residue at a rapid rate. This build-up is not just unsightly; it introduces three well-established risks:
- A fuel source for fire, sitting directly above heat-producing equipment.
- Reduced airflow, which makes the system work harder and less efficiently.
- A hygienic issue, where stale grease becomes a breeding ground for bacteria.
TR19 gives cleaning companies, facilities managers, and insurers a shared reference point. When your policy states that ventilation must be cleaned "to TR19," it means the work must be carried out to the operational standards defined in that document, followed by a post-cleaning inspection that records the results.
The Cleaning Process: What You Are Actually Paying For
A professional TR19 kitchen extract cleaning is a methodical, top-to-bottom process. It is not a spot-clean of the visible filters. Here is what a reputable contractor should do on site.
Pre-Clean Inspection and Planning
Before any physical work begins, the surveyor should assess the entire ductwork run from the canopy to the external discharge point. This establishes the starting condition and identifies any areas that are difficult to access. A photographic record of this "before" state is standard practice.
Canopy and Filter Cleaning
The canopies over your cooking line accumulate the heaviest grease deposits. These are first scraped down and degreased, then pressure-washed or steam-cleaned. The baffle filters are removed and cleaned individually. They should not simply be wiped in situ. Dirty filters restrict airflow and force the extract motor to work harder.
Full Ductwork Cleaning
This is the core of the service. The internal surfaces of the ducting must be cleaned along the entire length, not just the first metre inside the canopy. Contractors use a combination of manual scraping, rotary brushing systems, and vacuum units that maintain negative pressure so grease does not escape into the kitchen. In severe cases, chemical descalers may be required to break down baked-on carbon.
Every section of ductwork is cleaned, including vertical risers, horizontal runs, and the fan units themselves. A fan caked in grease is a significant fire risk and cannot be ignored.
The Final Verification
Once the cleaning is complete, the contractor inspects the interior again and photographs the "after" state. This provides visual verification that the system is free of significant residue.
Compliance, Certification, and Your Insurance Policy
Understanding how TR19 interacts with your insurance is important, but the nuance matters.
TR19 does not dictate a single numeric "grease thickness" pass/fail point. Experienced surveyors use a range of post-clean readings and visual assessments to determine whether the extract system has been cleaned to a commercially clean standard. When this is achieved, the contractor issues a compliance certificate that documents the works and the clearance readings.
This is where insurance becomes relevant. Commercial insurance policies frequently include a condition requiring the ventilation system to be cleaned at a defined frequency and maintained to recognised standards. You should read your policy to see exactly what it says. The BESA TR19 guidelines suggest the following maximum cleaning intervals based on cooking duration:
- Heavy use (12–16 hours per day): Every 3 months
- Moderate use (6–12 hours per day): Every 6 months
- Light use (2–6 hours per day): Every 12 months
The crucial legal point is that TR19 cleaning is about evidence. If you have a claim, your insurer will ask whether you have complied with policy conditions. Since the Insurance Act 2015, the outcome of a claim depends on whether a breach was causally relevant to the loss. We cannot predict what a claims department will decide, as every case is judged on its own facts. What you can do is ensure you have an audit trail.
Retain every TR19 compliance certificate alongside photographic evidence of the post-clean condition. This documentation is your primary defence. A clean system and a completed certificate demonstrate that you have taken reasonable steps to manage fire risk. Without that paper evidence, you are relying on memory and goodwill.
How to Buy TR19 Kitchen Extract Cleaning Correctly
Choosing the right contractor is the final piece of the puzzle. Here is what separates a meaningful clean from a superficial one.
- Ask about surveyor qualifications: The surveyor directing the job should hold relevant certifications such as the BESA GHT3 and GHO3 in ventilation hygiene. This indicates proper training in both hygiene testing and the operation of cleaning equipment.
- Demand a condition report: Inspect the "before" and "after" photographic records. If a contractor offers a certificate without any visual evidence, treat that as a red flag.
- Confirm the scope in writing: A TR19 kitchen extract cleaning service should explicitly state that the fan unit, ducting, canopy, and filters are all included in the quoted price.
- Check the access strategy: If the ducting is difficult to reach, the contractor may propose cutting access panels. Ensure you know about this before the job starts.
At BlueTick Extraction Hygiene, we serve kitchen operators across Peterborough and the East Midlands with a TR19 kitchen extract cleaning service that is fully documented and verified. Our principal surveyor holds the BESA GHT3 and GHO3 qualifications and a Certificate in Insurance (CII Level 3), so we understand precisely what underwriters and compliance officers need to see from a data perspective. We provide full cleaning of the canopy, filters, ductwork, and fans, followed by a compliance certificate that supports your fire safety file.
Do not wait for a hazard warning or a policy requirement to force your hand. Book a free site survey today to bring your extraction system up to compliance.