Pre-clean planning and safety checks
Before any hands-on work begins, confirm the kitchen cooking equipment that feeds into the extractor system. Map which hoods, duct runs, fan housings, and filters are connected so the cleaning scope is accurate. Lock out or isolate Kitchen exhaust cleaning the fan where required and ensure safe access to roof or high-level duct sections using proper equipment. Place warning signage and control slip risks by covering nearby floors and prep areas.
Next, verify the service history and current condition of grease deposits. Look for visible staining, recurring odours, oily residues around vents, and uneven airflow that can indicate partial blockages. Gather key information about the hood type, duct materials, and any previous access points so you can plan how to disassemble the system. If your facility includes sensitive processes, coordinate cleaning around food handling activities to reduce cross-contamination risk.
Cleaning checklist for ductwork, hoods, and fans
Start with surface preparation and targeted degreasing in the hood zone. Remove filters carefully, and clean them using suitable chemical processes that dissolve grease without damaging metals. Use controlled methods to prevent grease aerosols from spreading across Legionella testing the kitchen, and wipe down accessible hood surfaces to remove film residues. Inspect baffle plates and internal hood seams where grease tends to collect and then reassemble only after surfaces are dry.
Then proceed to the ductwork and fan components using a step-by-step approach. Access ducts through inspection panels where available, and remove sludge that has built up on internal walls. Clean fan blades, the fan housing, and the immediate surrounding areas so the airflow pathway remains unobstructed. After cleaning, check that dampers move freely and that all seals and gaskets are intact, because leaks can reintroduce contamination and reduce ventilation efficiency.
Verification steps, documentation, and Legionella testing
After cleaning, perform verification to confirm the kitchen exhaust system is restored to a hygienic operating condition. Check airflow visually and operationally where safe, and confirm that the hood captures vapours properly during simulated cooking conditions. Review cleanliness of internal and external surfaces, ensuring there is no remaining heavy grease film or residue at joints. Any damaged components should be recorded immediately so repairs happen before performance issues return.
Grease and moisture can contribute to microbial growth, and testing helps validate that controls are effective. Document the results, along with cleaning method details, access points used, and parts removed or replaced. Maintain a clear service record for audits and internal reviews, showing that kitchen ventilation hygiene is managed consistently.
Hygiene standards, ongoing maintenance, and fire safety alignment
To keep results stable, establish a routine maintenance schedule that matches your cooking intensity and the types of oils used. High-load operations typically require more frequent intervention to prevent thick grease build-up in ducts. Train kitchen and facilities teams on what to watch for, such as persistent odours, visible grease trails, unusual fan noise, or reduced capture performance. Use the same checklist approach each visit so inspections are comparable and issues are caught early.
Cleaning is also a fire safety measure, since grease accumulation can increase ignition risk in extractor systems. Ensure that all staff understand the relationship between grease control and safe ventilation performance, and that cleaning activities follow relevant compliance expectations. If corrective actions are needed—such as replacing worn filters, addressing leaks, or improving access panels—schedule them promptly.
Conclusion
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