EC Cleaners Network · Kitchen Extract Problems
Persistent kitchen extraction odours can come from contamination, poor capture, airflow problems, the discharge arrangement or a change in the way the kitchen is operating.
Start by establishing where the smell is noticed. Odour lingering inside the kitchen can point towards capture, hygiene or ventilation performance. Odour affecting neighbours or other parts of the building can bring discharge location, external dispersion and nuisance issues into the investigation.
Where is the smell being noticed?
Send the site location, where the odour is noticed, when it occurs and which cooking process is involved. Include any neighbour, landlord or local authority complaint, the latest cleaning or ventilation report and details of recent kitchen changes where available.
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What can cause smells from a commercial kitchen extraction system?
Cooking naturally produces fumes, vapours and odours. A well-performing ventilation system should capture those emissions at source and discharge them to a suitable external location.
HSE guidance says commercial kitchen ventilation is needed to remove significant quantities of fumes, vapours and heat and discharge them safely outside. Persistent odours can therefore be a useful sign that the capture, cleanliness, airflow or discharge arrangement deserves attention.
The location of the smell matters. First establish whether the problem is inside the kitchen, elsewhere in the building or outside the premises.
Read the parent guide to commercial kitchen extraction problems →
Common causes of persistent kitchen extraction odours
Grease contamination
Grease and cooking residues can accumulate on filters, canopy surfaces, ductwork and fan components. Where contamination is significant, it can contribute to persistent stale or greasy odours.
Dirty or overloaded filters
Filters that are not being cleaned or replaced appropriately can retain grease and odour and may also restrict airflow into the extract system.
Poor canopy capture
If cooking fumes are escaping before they enter the canopy, odours can remain in the kitchen or spread into adjoining areas.
Weak airflow
A fan, control, duct restriction or other ventilation issue can reduce the amount of contaminated air being removed from the cooking area.
Replacement air problems
Poorly arranged make-up air can disturb the cooking plume or make it harder for the canopy to capture fumes consistently.
Discharge location or dispersion
The extract may be removing fumes from the kitchen but discharging them where odours affect windows, neighbouring premises, public areas or air intakes.
Changes in cooking activity
A new menu, different equipment, greater production or longer operating hours can increase the amount or character of odour entering the extraction system.
If the smell is inside the kitchen
Odour lingering inside the kitchen can indicate that fumes are not being captured or removed as effectively as expected. The investigation should consider canopy capture, filters, extract volume, replacement air, fan performance and the cleanliness of accessible components.
If smoke is also escaping from the canopy, or the kitchen has become noticeably hotter, those symptoms strengthen the case for looking at ventilation performance rather than treating the issue only as an odour problem.
If the smell is affecting neighbours or other premises
External odour complaints need a different line of enquiry. The issue may involve the discharge position, extract performance, cooking process, local airflow around the building or the level of odour control provided by the system.
In England, GOV.UK states that councils must investigate complaints about smells from industrial, trade and business premises that could amount to a statutory nuisance. It specifically identifies food processors and commercial kitchens with poor extraction as possible sources of nuisance smells.
A statutory nuisance assessment depends on the actual circumstances. GOV.UK says councils can consider the source, the character of the area, the number of people affected, frequency, duration, strength and character of the smell, together with weather conditions.
A neighbour complaint should not automatically be converted into a duct cleaning instruction. Keep the complaint, location and operating circumstances visible so the actual source can be investigated.
Could cleaning solve the odour problem?
Cleaning may be part of the solution where grease contamination is contributing to the smell. HSE guidance says kitchen ventilation should be easy to clean and warns that fat residues and blocked air inlets can reduce efficiency and increase fire risk.
Cleaning cannot correct every odour problem. If fumes are not being captured, the fan is underperforming, replacement air is disturbing the canopy, or the discharge is affecting neighbouring properties, further ventilation or mechanical assessment may still be needed.
Has the menu, equipment or production level changed?
Different cooking processes produce different combinations of grease, smoke, vapour and odour. A ventilation system that performed adequately for one operating pattern may behave differently after a change in menu, appliances or production volume.
When the odour problem follows an operational change, record what changed and when. This gives the ventilation contractor a much stronger starting point than a general instruction to clean the system.
Look beyond the visible canopy
Persistent odour can involve several parts of the extract route. The relevant system may include filters, canopy, plenum, ductwork, risers, fan, discharge and any odour control equipment fitted to the installation.
Historic EC Cleaners project imagery illustrates a commercial hospitality environment. It is not presented as evidence of an odour defect or ventilation problem at the photographed premises.
What should you record before the odour problem is investigated?
- Where the smell is noticed. Kitchen, dining area, corridor, roof level, neighbouring property or another location.
- When it happens. Record the time of day, cooking process and whether it happens continuously or only during particular services.
- The character of the smell. Greasy, burnt, stale, smoky or another recognisable description.
- Recent operational changes. Include menu, equipment, trading hours and production volume.
- Recent maintenance. Find the latest cleaning, inspection, filter or fan maintenance records.
- Complaints received. Keep landlord, neighbour, managing agent or local authority correspondence with the requirement.
- Known system limitations. Record inaccessible ductwork, fan access or discharge issues already identified.
Which contractor route may be appropriate?
Grease contamination
Where contamination is contributing to persistent odour, a competent kitchen extract cleaning contractor may be required.
Capture or airflow problem
If odour remains because cooking fumes are not being captured properly, competent ventilation assessment may be needed.
Fan or mechanical problem
Where fan performance, controls or other mechanical issues are involved, use a competent ventilation or mechanical specialist.
External discharge or nuisance issue
Where odour is affecting neighbouring properties or public areas, the investigation may need to include discharge arrangement, odour control and any local authority requirements.
Access problem
If internal ductwork, fan or other sections cannot be inspected or maintained, access may need to be resolved first.
Unclear previous evidence
If earlier reports do not make the system, cleaning scope or remaining issues clear, organise the evidence before another instruction is issued.
Related kitchen extract problem guidance
This page focuses on persistent odour. The related pages cover weak fan pull, smoke spillage and the wider range of extraction problems.
Commercial kitchen extraction odours: frequently asked questions
Why does my commercial kitchen extraction smell?
Persistent odours can be linked to grease contamination, dirty filters, poor canopy capture, weak airflow, inadequate replacement air, contaminated ductwork, fan or discharge problems, or a change in the cooking process. The smell should be investigated in the context of where it is noticed and when it occurs.
Can dirty ductwork cause kitchen odours?
Yes. Grease and other residues can accumulate on internal surfaces and contribute to persistent odours. Cleaning may therefore be relevant, but the wider ventilation system and discharge arrangement may also need to be considered.
Why can cooking smells remain even when the extractor fan is running?
A running fan does not prove that the canopy is capturing fumes effectively or that the system is moving the expected airflow. Poor capture, replacement air problems, blocked filters, contamination, fan performance or airflow disturbance can all contribute.
What if the smell is affecting neighbouring properties?
External odour complaints should be taken seriously. In England, councils must investigate complaints about smells from industrial, trade and business premises that could amount to a statutory nuisance. Poor commercial kitchen extraction is specifically identified by GOV.UK as a possible source.
Can cleaning alone fix an external kitchen odour complaint?
Not always. Cleaning may help where grease contamination is contributing to the smell, but external odour problems can also involve discharge position, extract performance, odour control, cooking process and the way fumes disperse outside the building.
Can a menu change make kitchen odours worse?
Yes. Different cooking processes can produce different types and quantities of fumes and odours. A change in menu, equipment or production volume can alter the burden on the ventilation system.
What should I send if I need help with a kitchen extraction odour problem?
Send the site details, where the smell is noticed, when it occurs, the cooking process involved, recent changes, the latest cleaning or ventilation report, any complaints received and any known fan, access or discharge issues.
Is a kitchen extraction smell affecting the site or neighbouring premises?
Send the site details, where the odour is noticed, when it occurs and any cleaning, ventilation or complaint information already available. EC can help organise the requirement so contamination, capture, airflow, discharge and nuisance issues are not mixed together before the appropriate independent specialist is approached.
Responsibility statement:
EC Cleaners Network is operated by Search and Submit Ltd. Search and Submit Ltd does not inspect, clean, test, survey, design, remediate, certify or technically approve kitchen extraction or ventilation systems. Independent appointed contractors and competent professionals remain responsible for technical assessment, safe working, quotations, physical delivery, reporting, certification and professional conclusions within their appointed scope.
TR19® Grease and TR19® Air are BESA specifications. References are descriptive and no BESA endorsement of or affiliation with EC Cleaners Network is claimed.