Duct cleaning in a commercial kitchen is usually quoted and judged as one job: someone scrubs a hood, the job is done. On the shop floor the complaint is different. The crew has spent half the shift walking back for a different nozzle, a different brush, a bucket of solvent and a ladder, and the flat panel and the narrow duct joint still clean at two different speeds. Accessories are where that difference is settled. Before you compare prices, list the parts by what they have to touch and check the list against the surfaces you actually clean.
Match the head to the surface, not to the job title
A flat hood panel, a baffle filter, a duct joint and a fan housing need different contact conditions even when the dirt is the same cooking oil. A wide flat head spreads heat over a panel and lets you work a large area in a few slow passes. A narrow jet concentrates the same heat on one line, which is what a seam, a rivet row or a corner of an angle needs. The two are not interchangeable: a wide head on a duct joint leaves heat and vapour in open space instead of at the deposit, and a narrow jet on a panel wastes the shift. On the PowerDe HW02 fixed steam cleaning machine page, the cleaning method is described as a high-pressure water gun with a nozzle, and the machine switches between dry steam and wet steam, so nozzle selection and mode selection are two decisions taken together, not one.
Where the deposit has been building for a long time, one line on the mechanism is worth stating, because it changes what you expect from an accessory. The heat makes the oil layer mobile again and the moving vapour carries the lifted soil away. That is why access tools and dwell time matter more than scrubbing force on a duct, and why a tool that cannot be held still over one spot for a few seconds will not finish the job no matter how many attachments come in the box.
Extension tools decide whether the duct is reachable at all
Ask each supplier, for the exact configuration you are quoting, what the hose length, wand length and accessory set actually are. On the hand-pushed steam cleaning machine listing, hose and wand lengths are not published, so the number has to come from the written data sheet, not from a catalogue photo. Then measure, in metres, the distance from the nearest power point and water point to the furthest access hatch you intend to clean, and walk that route. If a cleaning point can only be reached through a 400 mm hatch, then the working question is not what the machine can do, it is what diameter of tool can pass that opening and still be steered inside.
For most kitchen ducts the useful set is a short rigid extension for close work inside a hood, a longer extension for reaching along a run from one opening, and an angled head so the vapour leaves along the surface rather than straight back at the operator. Bent and angled pieces also decide whether you can work upward on an underside without holding the tool above your head for ten minutes, which is where crews cut a job short.
Brushes and scrapers for lifted soil, not for breaking it down
Once heat has moved the grease, the soil has to be gathered before it is rinsed or wiped, and that is the task of the brush. Stiff stainless wire will bite into stainless steel and leave scratches that hold grease faster afterwards, so stainless surfaces need a softer medium and a scratch test on a hidden area first. Use a scraper for a thick crust at a duct joint, and stop using it the moment the layer is soft, because a scraper on a clean panel is damage, not cleaning. On an old machine shop floor the pattern is well understood and it repeats in kitchens: force that works on a hard crust destroys the finish underneath it.
Containment is an accessory question
Steam loosens soil, it does not remove it. The lifted grease has to land somewhere, and if you have not planned that, it lands on the floor, in the drain and eventually in the grease interceptor. A drip tray clamped or hooked under the section being cleaned, a hood-shaped catcher, a bucket directly below the work and a recovery vacuum or mop for the run-off are all items to list on the quotation, not items someone improvises on the day. This is also why a machine with an integrated vacuum is treated differently in a kitchen from a machine with no vacuum: in the published configuration of the fixed steam cleaning machine HW02 the dry and wet steam modes are paired with a vacuum cleaner, which is what lets a crew work above an open area without leaving puddles below.
Mode switching, protection and what the accessories do not cover
Dry steam carries less moisture, so it is the mode people reach for near anything that must stay dry. Wet steam is used where a deposit needs soaking first. An accessory list that does not say whether the two modes can be switched at the wand, or whether switching means walking back to the machine, is an incomplete list. The protection functions to check against your site are leakage, short-circuit, high-temperature, high-voltage, water-shortage and high-voltage-explosion protection, and they are conditions of entry rather than optional extras. The published parameter table for the HW02 220V steam cleaning machine gives 220 V supply, 6 kW heating power, 160 °C steam temperature and 0.8 MPa vapour pressure with an 80 L SUS304 tank; that set of numbers belongs to that model in that configuration, and some product images show indicative display readings that differ from the table, so ask for the confirmed sheet of the exact configuration.
Two exclusions hold whatever accessories you buy. Steam is not directed at bearings and relubrication points, motor terminal boxes, control cabinet interiors, panel gaps, ventilation openings, sensors or cables, and it does not replace the structural check on a duct: rust, thinning, a patched seam or a damaged support has to be repaired before it is cleaned. Accessory choice also does not decide the cleaning interval. That is set per section, with hoods and filters at a high frequency and long horizontal runs at a lower one, recorded with who does it, when and how the result is accepted.
Before you order: one paragraph and one test
Send the supplier four things in writing: the surface list with the deposit described by how hard it is (fresh film, semi-dry sludge, hardened polymerised layer), the distance from power and water to the furthest point, the size of every access opening, and the time window in which the kitchen must be back in service. Then test three spots chosen so the setup can fail — the heaviest duct joint, a section beside something that must stay dry, and one removable filter. Record warm-up, dwell per pass, how many passes lift the hard layer, which mode was used, how the run-off was collected, and how long until the area was dry enough to walk on. Compare those minutes against your current method in the same units.
A closing note in fairness to the reader: the PowerDe product page for HW02 documents vehicle exterior cleaning at filling stations and parking areas, interior vacuuming and disinfection, and engine-compartment cleaning. Kitchen exhaust ducts are an adaptation to be proven on your own surfaces in a trial, and where the ductwork has internal sections, irregular parts or a very short service window, that goes to customised steam cleaning equipment as a working brief with photographs, the deposit breakdown and the exclusion list, so the accessory set and the machine are specified together.
