Ventilation is usually the last part of a commercial kitchen to get attention and the first part to fail quietly. Hoods, baffle filters, duct runs, dampers and exhaust fans keep running through every service, and each hour of cooking leaves another thin layer of grease on the surfaces inside them. That layer hardens, narrows the airflow, makes the kitchen hotter and smokier, and turns a short cleaning job into a long one. Planning the work in advance, meaning a clear record of what has to be cleaned, how often, by whom and with what, is what stops the job from being left until a breakdown forces the issue.
Take a full inventory of the ventilation system
Start by writing down every component that moves air: the canopy hoods above each cooking line, the baffle filters and grease cups inside them, the ductwork between the hoods and the roof, inline and rooftop fans, make-up air louvers, volume and fire dampers, and the exhaust terminal outside the building. Note how each one is reached. Some filters lift out by hand, some ducts have access panels, a rooftop fan may need a ladder or a roof permit, and a fan housing cannot be opened at all while extraction is running. A one-page sketch of the system, filed with the cleaning documents, lets a new cleaner or a new contractor locate every part without being walked through the kitchen.
Set the frequency from the cooking load, not from habit
How quickly grease accumulates depends on what is cooked and for how long. A kitchen that fries or grills for several hours a day loads its filters and ducts far faster than one doing batch preparation and reheating. Some starting points are easy to agree on: grease cups emptied at every close-down, baffle filters degreased weekly, hood interiors and reachable horizontal surfaces wiped weekly, and duct interiors and fan housings cleaned at longer intervals that are set by inspection rather than by the calendar.
Inspect the same point each time, for example a length of duct just behind the filters or one accessible fan blade, with a good light, and write down what you find. Those notes are what justify moving an interval earlier or later. A schedule that only says "quarterly" gives you nothing when the menu changes, the opening hours extend, or a new griddle is added to the line.
Choose a method that works with heat
Cold water and detergent struggle against baked-on grease, because heat is what loosens it. Removable baffle filters are commonly soaked in a hot degreasing bath and then rinsed. The parts that cannot be taken away, such as hood interiors, duct walls and fan housings, respond best to hot water or steam. Saturated steam at a high temperature softens grease that has polymerised on metal, so scrubbing turns into a wipe. The ability to switch between dry steam and wet steam is worth specifying: dry steam suits vertical and overhead surfaces because it leaves very little runoff dripping into the kitchen, while wet steam or hot water carries the energy needed for thick deposits.
Specify the equipment before you shop for it
Write the specification down before looking at machines. The figures that decide whether a unit can do this work are steam temperature and vapour pressure, heating power, water tank capacity and tank material, the electrical supply it requires, whether it is a fixed installation or a unit that can be pushed through the kitchen, and the safety cut-outs it provides. As a reference point, the fixed PowerDe HW02 steam cleaner is documented at 160 degrees Celsius steam temperature and 0.8 MPa vapour pressure, with 6 kW of heating power, an 80-litre tank made of SUS304 stainless steel, a 220 V supply, dry and wet steam modes, and protective functions for leakage, short circuit, high temperature, high voltage and water shortage.
That machine is listed on the product page for vehicle exterior, interior and engine-compartment work, so talk to the manufacturer about central kitchen cleaning equipment and about kitchen exhaust duct grease cleaning before you write a kitchen specification, and ask them to confirm which configuration suits hoods, ducts and fans in a working kitchen.
Put the plan on paper with names attached
A plan only exists once each task has an owner. For every component in the inventory, record the frequency, the method, and the person or contractor responsible. Then decide what evidence remains afterwards: a dated line in a log, a photograph before and after the work, and for contracted cleaning an invoice that names the components actually reached rather than saying only "kitchen extraction cleaned". Train at least two people, because a routine that lives in one head disappears with that person. Finally, agree in advance when extraction may be stopped; no one can open a fan housing safely in the middle of service, so the shutdown window belongs in the schedule alongside the task.
Mistakes that break a good plan
- Cleaning the filters you can see and never the duct behind them, where most of the deposit collects.
- Ordering a machine without checking the available power supply, the water inlet, and the route it must travel to reach the kitchen.
- Assuming better equipment replaces inspection. Steam makes cleaning shorter; it does not tell you when cleaning is overdue.
- Keeping the schedule in someone's memory instead of in a folder next to the system sketch.
- Deferring heavy duct deposits until something fails, when accumulated grease in a duct is also a fire hazard.
A workable plan is mostly preparation: know every component, inspect a fixed point and record what you see, let the record set the interval, pick a method that applies heat instead of fighting grease with cold water, and keep the names and the evidence on file. Handled that way, ventilation cleaning stops being an emergency and becomes one more predictable job in the kitchen week.
