TR19 compliance: a plain-English guide for commercial kitchen operators

So it’s no wonder that the stuff hiding above your head often gets forgotten. But the trouble is, that’s exactly where one of the biggest fire risks in your kitchen is lurking.

Grease builds up inside your extraction system whether you’re thinking about it or not. Left long enough, it turns into fuel waiting for a spark. That’s the whole reason TR19 compliance exists: to set recognised standards for inspecting and cleaning commercial kitchen extraction systems. It’s also what gives you the paperwork to prove you’ve actually done it, not just wiped the canopy and hoped for the best.

Whether it’s a café, restaurant, school kitchen, pub, hospital canteen or takeaway that you’re running, here’s a quick guide to understanding TR19 without wading through a mountain of technical waffle.

What is TR19 kitchen compliance?

In plain terms, TR19 kitchen compliance means your kitchen extraction system is clean enough to meet UK industry guidance for cleaning commercial kitchen extract systems.

TR19 comes from the Building Engineering Services Association (BESA), and it sets out how ventilation systems should be inspected and cleaned. For kitchens specifically, the document that matters is TR19 Grease. There’s also TR19 Air, which deals with general ventilation and indoor air quality rather than cooking fumes, but if someone’s talking about TR19 compliance for a commercial kitchen, nine times out of 10, they mean TR19 Grease.

Why does it actually matter?

Every time something hits the fryer, tiny grease particles travel up into your extract system. They cling to filters, fans and ductwork, building up quietly where nobody’s looking. More than just a hygiene headache, that grease accumulation becomes fuel.

Why is TR19 grease compliant cleaning important?

This isn’t box-ticking for the sake of it. A neglected extraction system causes real problems, which tend to show up all at once.

When hygiene standards slip, grease deposits can raise your fire risk. And when extraction performance drops off, it puts more strain on your equipment. Plus, if you can’t show proper maintenance records, your insurer may not be quite so understanding when you need them.

What actually needs cleaning?

TR19 covers the whole extraction system, not just the bit above the cooker that’s visible when the Environmental Health Officer (EHO) walks in.

A proper duct cleaning service works the full grease path: the canopy and plenum, the grease filters, the internal ductwork, the fans and motors, right through to the discharge point outside the building. The system also needs proper access panels, because if an engineer can’t physically reach a section of ductwork, they can’t clean it either, no matter how good their kit is.

As we like to say, we’re not just wiping crumbs, we’re showing grease and fire risk the door. That’s what a proper clean looks like, top to bottom.

How often is a TR19 inspection required?

Most commercial kitchens need professional extraction cleaning every three, six or 12 months, depending on how heavily the kitchen is used.

• Heavy use, roughly 12 to 16 hours a day or more, calls for cleaning every three months.
• Moderate use, around 6 to 12 hours daily, stretches to every six months.
• Light use, say 2 to 6 hours a day, can usually go 12 months between cleans.

These cleaning frequencies exist to keep grease deposits from creeping up on you. Rather than guessing, many specialist contractors measure TR19 grease deposit levels using recognised testing methods like Wet Film Thickness Testing (WFTT) or Deposit Thickness Testing (DTT).

Current TR19 standards work on these benchmarks:

• 50 microns of grease is what you’d expect straight after a compliant clean.
• 200 microns is the ceiling before a cleaning becomes necessary.
• 500 microns means urgent remedial cleaning is needed.

These numbers aren’t plucked from thin air. These are the grease thickness benchmarks used when assessing commercial kitchen extract systems under TR19 Grease guidance.

What do you get once the cleaning’s done?

Once the work’s finished, you need paperwork to prove it.

At Kitchen Deep Cleaning, that comes in the form of a BESA Post Clean Report (PCR), alongside a TR19 certificate confirming the work meets the required standard. BESA sets out specific guidance on what a proper PCR needs to cover, and a decent one should give you the full picture, not just a few photos and a pat on the back.

A proper PCR includes:

• Before and after photographs
• Micron readings at multiple key locations across the system
• Technical diagrams showing exactly what was cleaned, and what wasn’t
• Details of any risks identified during the clean
• A statement confirming whether a full clean was completed
• If it wasn’t, the reasons why (usually down to an access problem), along with guidance on what needs to change to put that right
• Your current cleaning frequency, and a recommended frequency if what you’re doing now isn’t cutting it
• The TR19 compliance certificate itself

Keep this paperwork somewhere safe. If your insurer asks for evidence, or an EHO wants to see your maintenance records, you’ll be glad it’s not buried in a drawer somewhere.

Note: If a full clean couldn’t be completed, that’s not something to be glossed over. A contractor who tells you straight that access was a problem, and what needs sorting before it can be fixed, is doing right by you. It’s far better to know now than to find out the hard way.

The cost of obtaining TR19-compliant cleaning and certification

There’s no single price tag, because no two extraction systems are quite the same.

The TR19 compliance certificate cost for UK businesses comes down to things like the size of your kitchen extraction system, how long and complicated the ductwork is, how easy the system is to access, how much grease has built up, and whether any remedial work is needed on top of the clean.

A sprawling system with awkward ductwork naturally takes longer than a small café setup. But remember that professional commercial kitchen cleaning is nearly always cheaper than the alternative, which is damaged equipment, a shut kitchen, or an insurance investigation dispute after a fire.

Stay compliant without the faff

Nobody enjoys thinking about what’s hiding inside ductwork. Fortunately, you don’t have to. Get it cleaned properly, keep hold of the paperwork, and it’s one less thing to worry about when the next EHO inspection rolls around.

At KDC Food Hygiene Ltd, we handle professional deep cleaning and duct cleaning that covers the whole grease path, from the canopy right through to the discharge point.

Need a proper cleaning before your next inspection? Give us a bell. We’re always happy to help out.

FAQs

What is TR19 kitchen compliance?

It’s the BESA standard for cleaning commercial kitchen extraction systems, aimed at cutting grease build-up and keeping fire risk down.

How often should a commercial kitchen extraction system be cleaned?

It comes down to how many hours your kitchen’s running. Heavy-use kitchens are looking at every three months; lighter-use sites can often stretch to once a year.

What’s included in a TR19 clean?

The whole extraction system, not just what’s visible. That means the canopy, filters, ductwork, fans and the discharge point.

Do I need a TR19 certificate?

It’s advisable, as it’s your proof that the system’s been professionally cleaned, and it comes in handy for insurers, audits and showing you’re on top of maintenance.

What happens if grease builds up inside ductwork?

Fire risk goes up, extraction gets less efficient, and you’re looking at pricier repairs down the line. A regular professional cleaning keeps things safe and compliant.