Extraction Access Points: Why Full System Access Matters for a Compliant TR19 Clean

Think about it: a canopy can be spotless while the ductwork behind it is still holding plenty of grease. If nobody can get to those sections, they can’t be properly cleaned. The fact is that in busy kitchens, hotels, hospitals, takeaways and stadiums, grease-laden vapour passes through the baffle filters and carries on through metres of horizontal duct, bends and vertical risers.

That’s where TR19® Grease and proper kitchen extract cleaning come in. This is BESA’s specification for managing the fire risk associated with grease accumulation in kitchen extractions, covering how they should be inspected, cleaned and verified. Put simply, access is important because you can’t clean what you can’t reach.

TR19 access panels for extraction cleaning: why they matter

Let’s talk about TR19 access panels, the hatches fitted into extraction ductwork that give a technician physical access to inspect, scrape and degrease the internal duct surfaces, rather than working on it from a distance. Without suitable entry, a section of duct may not be capable of being properly inspected, cleaned and verified.

Know that grease doesn’t build up evenly through a system. It can build up along horizontal runs, on bends and around components where airflow and grease-laden vapour behave differently. These are exactly the spots a brush pushed in from the nearest hatch won’t reach. In other words, access panels give your cleaning team a way in. They put access close to the areas where grease is most likely to collect, so those sections can actually be checked and cleaned.

Why does TR19 cleaning need full-system access?

A contractor can’t properly inspect, clean and verify sections of ductwork that are out of reach. Grease can accumulate along the duct run, including around bends and other components, so cleaning only the accessible section won’t show that the whole system has been cleaned.

Can missing access panels affect TR19 compliance?

One missing panel doesn’t make a whole system ‘non-compliant’ overnight (rest assured, it’s not that black and white). But poor access still blocks proper inspection, cleaning and verification, and that’s the whole point of TR19® Grease.

What full system access means for commercial kitchen extraction

So if the odd missing panel isn’t necessarily a deal-breaker, what does ‘full system access’ actually cover?

For a commercial kitchen extraction system, full access means providing suitable access to the parts of the kitchen extract system that need to be checked out. This starts from the canopy and filters through the ductwork and associated components to the discharge point, where applicable. For a typical commercial kitchen extraction system, that route runs through:

• Canopy and plenum
• Baffle filters
• Horizontal ducting
• Bends and changes of direction
• Vertical risers
• Exhaust fan and dampers
• Discharge terminal

Any one of those stages can sit metres from the kitchen itself, tucked into a roof void, ceiling space or fire compartment, such as in multi-storey hotels or hospitals. A single hatch by the canopy says very little about what’s reachable further down the run. BESA, the Building Engineering Services Association, recommends access at intervals along the whole route for exactly this reason.

Think of it this way: a system is only as accessible as its least accessible section.

Kitchen duct access hatch requirements: where access points should go

BESA guidance commonly refers to access panels at around 2-3 metre intervals where possible, but the required arrangement depends on the duct layout and whether all internal surfaces can actually be reached. What matters is that the system can actually be inspected and cleaned effectively along its whole length.

Access is also generally needed around bends, changes of direction and inline components such as fans, dampers and filter housings, since grease collects at these points and a hatch further away won’t help. The layout should be designed, or retrofitted, around what the system actually needs to stay inspectable, rather than squeezed in wherever’s easiest.

Why access matters when measuring grease deposits

Grease deposits are measured to assess the condition of extraction ductwork and determine whether cleaning is needed. TR19 Grease uses methods such as Deposit Thickness Testing and Wet Film Thickness Testing to assess grease build-up.

And this is exactly where access earns its keep. A reading’s only as good as the spot it was taken from. One taken near the canopy can’t tell you what’s happening further along a horizontal run, around a bend or inside a vertical riser, now can it?

That’s why suitable access points matter. If a section can’t be reached, its condition may not be properly assessed or recorded. Out of sight, out of mind … until an environmental health officer (EHO) with a torch finds it during an inspection.

How to check whether your extraction system has adequate access

Before the next extraction and duct clean, it’s worth checking six simple things:

• Can a technician access the full duct run, not just the section behind the canopy?
• Are there access points around bends and changes of direction?
• Can the fan and any dampers be reached and inspected?
• Are any sections in ceiling voids or risers that are currently inaccessible?
• Does the system diagram show where the access points actually are?
• Does the last cleaning report identify anything that couldn’t be reached?

If the answer to any of these is “not sure”, it’s worth finding out before the next clean, rather than discovering there’s a problem when the cleaner’s already on site.

What if extraction ductwork has no access panels?

Where sections of duct can’t be reached, they don’t get properly cleaned. A competent cleaning contractor should record them as inaccessible on the system map and in the post-clean report rather than leaving them off. The distinction between a ventilation system that’s been partially cleaned and one that’s genuinely cleanable throughout is central to what TR19 is trying to achieve.

Good documentation matters here because it shows what was actually inspected, cleaned and, where relevant, what couldn’t be reached. In England and Wales, fire safety duties under the Regulatory Reform (Fire Safety) Order 2005 sit with the relevant Responsible Person, and the condition of the extraction system can form part of that wider picture. Insurance requirements are separate and worth checking against your own policy.

In some cases, specialist remote inspection or cleaning techniques may help reach difficult areas. But they shouldn’t be treated as a blanket substitute for suitable physical access where access panels are needed for proper inspection and cleaning.

Can existing ductwork have access panels retrofitted?

Older kitchens are often missing panels altogether. This isn’t anyone’s fault; it’s just how they were built years back. So retrofitting is a normal part of bringing a system up to scratch for inspection and cleaning.

This is typically carried out in a few clear stages:

1. Survey the ductwork and identify sections with no existing access
2. Cut new openings in suitable positions
3. Fit access panels with sealing and fixings appropriate to that ductwork
4. Update the system diagram and clean the newly accessible sections

Where ductwork runs through a shared riser in a multi-let building, panel installation can raise the separate question: Who’s responsible for the ductwork fabric; the tenant or landlord? So it’s worth checking the lease before work starts.

How often should commercial kitchen extraction be cleaned?

TR19 Grease gives baseline cleaning frequencies based on daily operating hours and how much grease a kitchen produces, rather than one fixed calendar rule.

As a general guide, heavy use (of around 12 to 16 hours a day, such as a busy restaurant or a 24-hour hotel kitchen) has a baseline interval of three months. Moderate use (of six to 12 hours a day) might run to six months, and light use (of two to six hours a day) can often stretch to a year. But keep in mind that these are baseline frequencies, not a guarantee that every kitchen can safely follow the same interval.

A useful post-clean report should show:

• Before-and-after photos from consistent angles
• Micron readings from the relevant sections
• A duct schematic (diagram or map) marking what was and wasn’t accessible
• Written verification of the work carried out

A certificate on its own doesn’t tell you much. The report behind it should, as that’s where the real evidence lives.

Need help getting your system properly accessible?

Good access makes the rest of your TR19 clean much more straightforward. Fitting or repositioning panels doesn’t make a system compliant on its own, but it’s what allows the inspection, cleaning and verification that TR19 is actually built around.

KDC Kitchen & Duct Clean Ltd carries out ductwork inspections and TR19 cleans across UK commercial kitchens, from single-site restaurants to multi-storey hotel groups.

Not sure how accessible your system is? KDC can carry out an access audit and identify any areas that need attention. Give us a bell.

FAQs

Why does TR19 cleaning need full system access?

Because a section of duct can only be verified as clean where a technician can physically reach it, if part of the route is inaccessible, the clean can only ever be partial, however it’s described afterwards.

Is TR19 a legal requirement in the UK?

TR19® Grease is an industry specification published by BESA, not UK legislation. It sets a recognised framework for cleaning and verification, while separate legal duties around fire risk sit with the premises’ Responsible Person under fire safety law.

Can a system be fully cleaned if parts of the ductwork are inaccessible?

Not in any meaningful sense. Those sections should be recorded as inaccessible on the diagram and reported rather than presented as cleaned. They should be addressed by retrofitting access or, occasionally, a specialist remote method.

What should a TR19 cleaning report include?

Before-and-after photos from consistent angles, micron readings, a duct schematic showing what was and wasn’t accessible, and written verification of the work. A certificate alone doesn’t confirm any of this.

Does a canopy clean include the extraction duct?

Not necessarily. A canopy clean typically covers the filters and visible surfaces, while the ductwork, risers, fan and dampers behind it need separate access to be properly inspected and cleaned.