Grease does not wait for a scheduled shutdown. It builds up quietly behind hood filters, coats the inside of exhaust ducts, and gradually slows the airflow that keeps a kitchen comfortable and safe. When the buildup finally shows up as smoke drifting into the dining room or an unexpected visit from the fire marshal, a routine cleaning job has turned into an emergency. For facility teams, the difference between a manageable routine and that emergency is usually a written checklist. A good checklist tells every crew member what to clean, how often, how to do it, and how to prove it was done.
Step 1: Inventory every component the air touches
Before setting any schedule, walk the kitchen with a notepad and list every part of the ventilation system, from the cooking line to the roof. A checklist cannot cover what it does not name, so include:
- Hood canopies, grease cups, and perimeter panels
- Baffle grease filters and the racks they sit in
- Exhaust ducts, including horizontal runs and the section that penetrates the wall
- Exhaust fans, fan housings, belts, and fire dampers
- Make-up air units, louvers, and supply diffusers
- The exterior exhaust terminal and its grease containment
Photograph each item as you record it. These baseline photos show how fast grease actually accumulates in your kitchen, which is far more useful for setting intervals than any generic schedule.
Step 2: Set frequencies by cooking load, not by the calendar
A checklist that puts every kitchen on the same schedule fails in both directions: a wood-burning grill cleaned twice a year is a fire hazard, while a seasonal community kitchen cleaned monthly wastes labor. Industry practice and the guidance commonly referenced in fire codes such as NFPA 96 group cleaning frequency by how heavily the kitchen runs:
- Solid-fuel cooking (wood grills, rotisseries): filters weekly, hood interiors monthly
- High-volume, long-hour operations: filters weekly, hood interiors monthly, ducts and fans quarterly
- Standard cafeterias and fast-food kitchens: filters weekly to monthly, ducts and fans about every six months
- Low-volume or seasonal kitchens: at least once a year
Treat these as starting points. Your local fire code, insurer, or franchise brand may set stricter intervals, and the checklist should follow the strictest requirement that applies to your site.
Step 3: Write a task and an acceptance criterion for every line
"Clean the hood" is not a task; it is a wish. Each line of the checklist should carry enough detail that two different people would do the same job:
- The component and its exact location (hood section, duct run, fan unit number)
- The specific task (soak filters, scrape and degrease the canopy interior, brush a named duct section)
- The frequency and the date last completed
- The method and materials, including chemical dilution and dwell time
- The responsible person or contractor
- An acceptance criterion anyone can verify
Acceptance criteria should be observable: filter metal visible through every baffle, no grease film on the hood interior, fan blades free of deposits, dampers opening and closing fully. If a supervisor cannot verify a line with a glance and a flashlight, rewrite that line.
Step 4: Match the cleaning method to the soil load
Fresh grease responds to a degreaser and a pad. Grease that has been heated repeatedly polymerizes into a hard, dark film that resists scrubbing, and that is where crews reach for heat instead of elbow grease. In commercial kitchen steam cleaning, high-temperature, high-pressure steam softens polymerized grease so it can be wiped or rinsed away with far less water and fewer chemicals than a conventional wash. The low moisture left behind means surfaces dry quickly, which matters in kitchens that reopen within hours.
The same logic applies to kitchen exhaust duct grease cleaning. Duct runs are usually brushed and scraped with negative-air extraction, but steam is a practical option on accessible sections, filter racks, and fan housings where hardened deposits resist chemical degreasers. Whatever method the checklist specifies, it should name the equipment, the protective gear, and the steps taken to protect the cooking equipment below the work area.
Step 5: Add the parts crews usually miss
Most ventilation fires start where grease hides. Build these items into the checklist explicitly so they are not left to memory:
- The fan housing and impeller, where a thin grease layer thickens slowly and unglamorously
- Fire dampers and their actuators, which must move freely in an emergency
- Make-up air louvers and diffusers, often skipped because they sit above the cooking line
- The exterior exhaust terminal, where drips stain walls and attract pests
- Grease containment cups and trays, which overflow quietly if they are never scheduled
- The space above the filters inside the canopy, the first place a fire climbs
Step 6: Turn the checklist into a record
An unsigned checklist is only a to-do list. Add a sign-off column with initials and date, and keep completed sheets, on paper or in your maintenance software, where an auditor can find them. Fire marshals and insurance surveyors routinely ask for cleaning records, and a contractor's invoice alone rarely shows what was actually reached. Photograph the same angles after each cleaning so the record shows a trend rather than isolated events, and review the whole checklist quarterly: if a component looks dirty before its next scheduled cleaning, the interval is too long.
Keep the list short enough to survive
A twelve-page procedure nobody follows is worth less than a one-page sheet that gets done. Start with the hood, the filters, and the first duct section, get that routine running reliably, then extend the checklist one component group at a time. Laminate the working copy, post it near the hood, and store the master file with the building's maintenance records.
If your facility is comparing steam against traditional degreasing for the kitchen and its ventilation components, the PowerDe cleaning equipment range covers high-temperature, high-pressure machines with dry and wet steam modes built for commercial and industrial use, and the manufacturer's engineering team can advise on configurations for fixed installations.
