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Extraction cleaning - regulations
A commercial kitchen is one of the most demanding spaces Part F has to deal with - heat, smoke, grease and gas all at once. Here is how the regulation applies to a kitchen, and why the paperwork means nothing if the ductwork is choked.
The short answer
Part F requires a commercial kitchen to be ventilated to remove heat, smoke and cooking fumes, with enough fresh make-up air to balance the extraction. For gas kitchens that make-up air is also a safety requirement, tied to an interlock that shuts off the gas if the airflow fails. The design guidance sits in Approved Document F and standards like DW172 - but the ventilation only keeps meeting it if the ductwork stays clean and clear.
The extract duty
A commercial kitchen throws off heat, steam, smoke and cooking fumes in quantities that need serious extraction. Part F requires extract ventilation from kitchens in non-dwellings precisely so those pollutants are removed at source and not spread through the rest of the building. The canopy, the extract ductwork and the fan are the system that meets this, capturing over the cookline and carrying everything to discharge.
This is the same extract system that grease cleaning is concerned with - which is the connection worth noticing. Part F requires the ventilation; TR19 Grease keeps the ductwork that provides it clean and safe. The regulation and the cleaning regime are two views of the same system.
The make-up air duty
Extraction only works if the air it removes is replaced. Pull large volumes out of a kitchen without providing make-up air and the system fights itself - the extract cannot achieve its design flow, the kitchen goes into negative pressure, doors are hard to open and the ventilation underperforms. Part F and the associated guidance therefore treat make-up air supply as part of the requirement, not an optional extra.
Getting that balance right is central to a kitchen ventilation design. It is why the supply and extract are sized together, and why a system that looks powerful on paper can still fail in use if the make-up air was neglected. Balanced ventilation is the whole point.
The gas safety overlap
In a gas kitchen the make-up air is not only a ventilation matter but a safety one. Enough fresh air has to be provided to prevent a dangerous build-up of combustion products, and the extraction is tied to a gas interlock - a control that shuts off the gas supply if the ventilation airflow stops. This requirement comes from the gas safety rules that sit alongside Part F, and it is why kitchen ventilation is treated with particular seriousness.
The upshot is that a commercial kitchen's ventilation answers to more than one regime at once: Part F for the ventilation provision, gas safety rules for the interlock and make-up air, and the ductwork standards for how it is all built. They point the same way - a properly designed, balanced, safe system - but a kitchen operator should know the ventilation is doing several jobs.
Where cleaning comes in
Part F is satisfied when the kitchen is built or altered, but the airflow it required depends on the ductwork staying clear afterwards. In a kitchen that means grease above all: extract ductwork narrows and its airflow drops as grease builds, so a system that met its design extract rate on day one can fall below it purely through neglect. The kitchen slips out of the performance Part F required without anything visibly changing.
That is the practical link between the regulation and the clean. Keeping the extract system clean to TR19 Grease is not only fire safety - it is what keeps the ventilation performing at the level the kitchen was designed and signed off to achieve. A choked extract is a compliance drift as well as a fire risk.
For the operator
For someone running a commercial kitchen, the takeaway is that the extract system sits at the meeting point of several duties - ventilation, gas safety and fire safety - and that keeping it clean is what keeps all of them satisfied in use. The design and the interlocks are set at installation; the ongoing performance is a maintenance question.
So a regular extract clean does more than manage grease. It keeps the airflow at the level Part F required, keeps the greasiest and most fire-prone part of the system safe, and keeps the ventilation on which the gas interlock depends working as intended. One clean, several duties supported - which is why the extract system is worth keeping on a proper cycle.
Questions
It requires the kitchen to be ventilated to remove heat, smoke and cooking fumes, with enough fresh make-up air to balance the extraction. The guidance is in Approved Document F, with standards like DW172 for kitchen ventilation design.
It is the fresh air supplied to replace what the extraction removes. Without enough of it the extract cannot reach its design flow and the kitchen goes into negative pressure - so supply and extract are sized together.
A control that shuts off the gas supply if the ventilation airflow stops, required for gas kitchens under the gas safety rules that sit alongside Part F, to prevent a dangerous build-up of combustion products.
Not directly, but the airflow Part F required depends on the ductwork staying clear. In a kitchen, grease build-up cuts the extract rate, so keeping it clean is what keeps the ventilation at its designed performance.
An industry standard setting best practice for the design of commercial kitchen ventilation systems, commonly referenced alongside Part F on commercial projects.
Because it does several jobs at once - ventilation under Part F, make-up air and interlock under gas safety rules, and fire safety under TR19 Grease. Keeping it clean supports all of them in use.
We clean the kitchen extract system to TR19 Grease, holding the airflow your kitchen was designed to provide.
