When a restaurant kitchen plans its deep-clean schedule, the grease filters behind the canopy almost always decide how long the job takes. Hoods, fans and ducts can be estimated from the number of outlets, but filters vary in size, in how long they have been running, and in how firmly the grease has bonded to the mesh. This article explains how facility teams build a defensible time estimate for that one item, so the whole cleaning window can be planned without guesswork.
Start with the workload, not the tool
A realistic estimate begins with three counts that any kitchen can produce in an afternoon: how many filter cassettes the canopy holds, how many of them are reachable without a ladder or a second person, and how many can be moved to a fixed washing point. A six-metre extraction line on a wok station may hold eight shallow cassettes cleaned weekly; a long griddle run may hold four deep boxes stripped monthly. Same kitchen, very different filter work.
The second variable is interval. A filter wiped and lightly degreased every week carries a soft surface film. A filter left for a quarter develops a thick, tar-like layer that no detergent soak lifts quickly. Facilities that log the last cleaning date per zone can group filters into light, moderate and heavy categories, and cost each group separately rather than averaging everything into one unreliable number.
Break the task into timed steps
Estimates go wrong when teams time only the scrubbing. For each filter, plan five steps and record the minutes for each:
- Removal and transport to the washing point, including the walk and any lifting equipment.
- Pre-treatment: scraping off loose build-up, or a dwell period while a degreaser works.
- The actual cleaning pass on both faces of the mesh, plus the frame.
- Rinsing and draining, so no residue returns to the canopy.
- Refitting and the check that the filter seats correctly and the fan still draws properly.
Once these five numbers exist for one light, one moderate and one heavy filter, the workload becomes arithmetic: multiply each category by the number of filters in it, then add a contingency for the items nobody planned for — a seized bracket, a filter that needs a second pass, or a canopy panel that has to come down to reach the last cassette.
What changes the per-filter time most
Method is the biggest single lever. Cold water and manual brushing on a heavy filter can absorb an hour per cassette and still leave the mesh partly blocked. Heat does most of the work instead: hot water softens the grease, and saturated steam pushes it out of fine mesh that a brush cannot reach. A dedicated restaurant kitchen grease cleaning setup shortens both the pre-treatment and the cleaning pass, because the dwell stage shrinks and the operator spends less time re-working the same face.
The washing point matters just as much as the machine. Teams that carry a hose and a bucket to the filter lose time on movement; teams that carry the filter to a fixed station clean in a controlled sequence and can batch several cassettes in one session. A fixed steam cleaning machine such as the PowerDe HW02 sits at that station, runs on a 220 V supply, and switches between dry and wet steam so the operator can use wet steam to loosen heavy build-up and dry steam to finish the mesh without leaving standing water. Its 80 L tank reduces interruptions to refill during a long batch.
Access is the third factor. Filters that need a ladder, a second pair of hands, or the removal of adjacent ducting add far more time than the cleaning itself. Where the layout is fixed and the same canopy is cleaned repeatedly, those access costs are paid once and then built into the standard time, which is exactly what makes future estimates reliable.
Turn a trial run into a standard time
The practical way to get numbers you can trust is to run one supervised session. Clean a small sample — two light filters, two moderate, two heavy — and record start and finish times for each step above. Convert the sample into minutes per filter per category. Multiply by the count of filters in the kitchen to get the labour hours for the current condition, then add a contingency for the unforeseen.
Repeat the sample after the interval changes. If a weekly light clean keeps filters in the light category, the monthly deep-clean line in the schedule falls, and the freed hours can move to the ductwork or the exhaust fan, which are usually the parts that get postponed. Buyers comparing equipment should ask suppliers for a trial on their own filters rather than accepting a generic figure, because the only number that predicts your schedule is the one measured on your workload.
Planning around service hours
Most kitchens cannot surrender the extraction line during service, so the estimate has to fit the cleaning inside a real window. Split the canopy into zones and clean the filters in one zone per session; the remaining zones keep cooking. Where a full stop is unavoidable, a faster method decides whether the job fits overnight or pushes into next-day prep. That is the point at which central kitchen degreasing planning and equipment choice meet: the schedule is driven by the cleaning hours you can compress, not by the calendar date you would prefer.
Record the result every session — filters cleaned, condition found, minutes used. After three or four cycles you have a baseline for your own kitchen, and any change in interval, method or equipment shows up as a measurable shift in hours rather than an argument about impressions.
A short checklist before you commit a time
- Count the cassettes per zone and mark which are hard to reach.
- Sort filters into light, moderate and heavy from the logged cleaning date, not from memory.
- Time all five steps, including removal and refitting.
- Confirm the washing point, water supply and power supply before the session starts.
- Add a contingency and write the actual figures back into the schedule.
Facilities evaluating their options can review the PowerDe cleaning equipment range or contact the team to arrange an assessment against their own filter condition.
