Why the wrong hood specification is the most expensive mistake in kitchen cleaning
A commercial exhaust hood is the job where a cleaning contractor's reputation is won or lost. Filters that will not come off, a canopy welded to ductwork that no crew can reach, a site with no hot water and no power near the extraction line — each of these turns a quoted job into unpaid extra hours, and a scratched or deformed filter panel into a liability claim. When a supplier recommends equipment for hood cleaning without asking questions first, the buyer gets a machine that is fine in the showroom and wrong in the kitchen. The questions below are the ones a competent supplier asks before naming a model, and every one of them changes the recommendation.
Question 1: What exactly is in scope — filters, canopy interior, or ductwork?
- Baffle filters and their frames only: the filters come off, so they can be cleaned off the machine, in a bath or on a rack, and the equipment choice changes accordingly.
- Canopy interior, plenum face and the accessible first section of duct: cleaned in place, which puts the emphasis on steam reach, mode control and runoff management.
- Duct run, fans and the exterior terminal: normally excluded from a between-shifts contract and handled as a periodic specialist job. Say so in the quote, in writing.
Scope decides whether the crew needs continuous steam at height, or a lower-duty unit that spends most of its time on the filters in a sink area. Do not let a single machine be sold for all three.
Question 2: What utilities exist directly at the extraction line?
- Mains power within reach of the hood, or does the crew work from a distant outlet across a live kitchen?
- A water supply at the point of work, and what fitting it has. The fixed steam cleaning machine PowerDe HW02 takes tap water through a 4-point internal-tooth joint (1/2 inch); if the kitchen's tap does not match, the plumbing must be arranged before the first visit, not discovered on it.
- Where the runoff goes. Grease-laden water from a hood cannot simply be washed into a general floor drain in many kitchens; a collection and disposal point must be agreed with the operator.
- Whether the kitchen is in service during the clean, which decides how much moisture the job may add to the air.
If the hood line has no usable supply, the recommendation shifts to a unit that carries its own water. The hand pushed steam cleaning machine PowerDe HMW3 carries a 50 L clean-water tank with a 4.5 kW PTC heater and dry- and wet-steam modes on a hand-push frame that fits a kitchen aisle.
Question 3: How much heat and steam does the deposit need?
Ask the operator how long the hood has been since its last deep clean, and ask for photographs of a pulled filter. Grease that is months old and polymerised is a different job from a weekly maintenance clean:
- For maintenance cleaning of a regularly maintained hood, dry steam is usually enough — heat with little water, so the kitchen stays workable.
- For encrusted filters and canopy faces, wet steam plus mechanical effort is required, and the time per filter should be priced honestly rather than absorbed.
- For a hood that has never been deep cleaned, quote a one-off restorative job separately from the recurring contract. Mixing them is how contractors lose money on a good client.
For the recurring contract, a mains machine that holds its output matters more than peak specification. The HW02 runs on 220 V with 6 kW of heating power, around 160°C steam temperature and about 0.8 MPa vapor pressure, an 80 L SUS304 tank, and switches between dry-steam and wet-steam modes plus a vacuum function on the same machine — so the crew is not walking between units mid-canopy.
Question 4: What are the physical constraints at the hood?
- Clearance beneath the hood and the working height of the crew: reach at arm's length above head height is where time is lost.
- Aisle and doorway widths from the store room to the hood, and whether the machine has to pass through a serving area.
- Filter weight and handling: how many people the filter handling needs, and whether a rack or bath is available.
- Fire-safety constraints: hot work near a grease-laden extraction system needs the operator's permit process, and the crew's method should be agreed with the site, not assumed.
Our PowerDe cleaning equipment series page lists the mains-powered and battery variants, so the supplier can match the machine to the site's utilities rather than the other way round.
Question 5: What does the client's contract and audit require afterwards?
- Is a signed cleaning record required per hood, with filter condition noted after the clean?
- Is a photographic before-and-after required — commonly demanded for insurance-driven extraction cleaning?
- Is a stated interval imposed by the operator's insurer, and does your scope meet it or merely coexist with it?
- Who signs off the plenum interior, and on what acceptance criterion — this is the line item that gets argued over at invoicing.
Anything the product pages do not publish — runtime, hose and wand lengths, accessory set, consumption per hour — should be confirmed with us for your actual hood count and shift before you commit to a purchase. Send us the hood photographs, the site's power and water position, and your contract scope, and we will tell you which machine and which mode to specify before the first visit rather than after the first complaint.
