Commercial Kitchen Extraction Cleaning: What You Need to Know
Why Your Extraction System Needs Regular Cleaning
Every time a commercial kitchen is in use, grease-laden air passes through the extraction system. Grease particles attach to the internal surfaces of canopy filters, ducting and fans, and with every service, that build-up gets thicker. It happens gradually — gradually enough that it can be easy to overlook — but the consequences of leaving it unchecked are significant.
Grease accumulation inside commercial kitchen ductwork is one of the leading causes of fires in catering premises across the UK. Once ignited, a grease fire inside a duct system is extremely difficult to suppress and can spread rapidly through a building. Regular commercial kitchen extraction cleaning is one of the most effective steps a kitchen operator can take to reduce that risk.
The TR19 Standard: What It Means for Your Kitchen
TR19 is the industry guidance document that sets out the standard commercial kitchen extraction systems should be cleaned to. Produced by the Building Engineering Services Association (BESA), it covers the internal cleanliness of ventilation systems and provides a recognised benchmark for ductwork hygiene across all types of commercial buildings — from restaurants and hotels to hospitals, schools and workplace canteens.
Cleaning to TR19 standards means the work goes well beyond wiping down visible surfaces. It involves a structured inspection and clean of the full extraction system — canopy filters, the canopy plenum, accessible ductwork runs, and the extract fan and housing — with the aim of bringing grease levels back within acceptable limits throughout the system.
A TR19 compliant clean also comes with documentation, and that paperwork matters. Find out more about TR19 grease cleaning and what the process involves.
What Happens If You Skip It
Skipping or delaying extraction cleaning doesn't just increase fire risk — it can have direct financial consequences.
Many commercial insurance policies include a requirement for regular, documented extraction cleaning as a condition of cover. If a fire occurs and there's no evidence that the system was being cleaned to an appropriate standard, your insurer may have grounds to reduce or refuse a claim. Given the cost of a commercial kitchen fire — equipment, premises, stock, downtime and reputational damage — that's an exposure no business should be taking on unnecessarily.
Beyond insurance, there are operational effects too. A heavily soiled extraction system simply doesn't work as well. Airflow is restricted, the kitchen becomes hotter and stuffier, cooking odours linger longer, and the extract fan has to work harder — shortening its working life and increasing energy use. Staff comfort and food hygiene standards are both affected.
How Often Should Commercial Kitchen Extraction Cleaning Be Carried Out?
Cleaning frequency isn't fixed — it should reflect how the kitchen is actually used. The TR19 guidance frames it this way:
Light use — occasional cooking, minimal frying: annually
Medium use — regular daily service: every six months
Heavy use — high-volume cooking, frequent frying or grilling: every three months
A high-volume restaurant kitchen frying at volume every day needs cleaning far more regularly than a staff canteen producing light meals a few times a week. Applying a one-size-fits-all schedule is a common mistake — and going too long between cleans on a heavy-use kitchen is exactly the scenario that creates serious fire risk.
The right approach is to have your system assessed and a cleaning schedule set that's appropriate to your operation, rather than picking an interval that sounds reasonable and hoping it's enough.
Don't Overlook the Gas Interlock System
Commercial kitchen extraction cleaning is one half of the maintenance picture. The other is making sure the extraction system and the gas supply to your cooking appliances are properly linked.
A gas interlock system is a safety device that restricts gas flow to appliances unless the kitchen's extraction system is confirmed to be running correctly. It's widely required under British Standards for commercial gas catering equipment — and it's a practical safeguard too, removing the risk of gas appliances being used in a kitchen without adequate ventilation running.
If your kitchen doesn't currently have a gas interlock system fitted, it's worth understanding whether one is required for your premises. Find out more about gas interlock systems and when they apply.
Keeping Your Kitchen Safe and Compliant
Commercial kitchen extraction cleaning isn't a box-ticking exercise — it's a genuine fire safety measure, an insurance requirement and a sign of a well-managed kitchen. The combination of regular TR19 grease cleaning and a correctly functioning gas interlock system gives kitchen operators the best foundation for keeping their kitchen safe, compliant and running efficiently.
GMSE provides commercial kitchen extraction and ventilation services across Kent and the South East, including TR19 grease cleaning and gas interlock system installation. If you're unsure whether your current maintenance schedule is adequate, or you need a first clean carried out, get in touch with our team to discuss your requirements.
For a full overview of the services we provide, visit our Kitchen Extraction & Ventilation page.
Frequently Asked Questions
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Commercial kitchen extraction cleaning is the process of removing grease and other contaminants from a kitchen's extraction system, including canopy filters, ductwork, and the extract fan. Regular cleaning reduces fire risk, supports insurance compliance and keeps the system working effectively.
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TR19 is the recognised industry guidance for the cleanliness of ventilation systems, produced by the Building Engineering Services Association (BESA). It sets the standard that commercial kitchen extraction systems should be cleaned to, and is widely referenced by insurers and building regulations as the benchmark for compliance.
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Cleaning frequency depends on how heavily the kitchen is used. As a general guide, light-use kitchens should be cleaned annually, medium-use kitchens every six months, and heavy-use kitchens every three months. A professional assessment of your system will give you a more accurate recommendation for your specific operation.
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Many commercial insurance policies require documented evidence of regular extraction cleaning as a condition of cover. Failure to maintain cleaning records can give insurers grounds to reduce or refuse a claim in the event of a kitchen fire. Always check the specific requirements of your policy.
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A gas interlock system is a safety device that restricts gas flow to cooking appliances unless the kitchen's extraction system is confirmed to be running correctly. Gas interlock systems are widely required under British Standards for commercial gas catering equipment. Whether one is required for your specific premises depends on your setup, insurer and local authority requirements.