Hotpot restaurant equipment technician - exhaust system cleaning and maintenance SOP: hood, filters, purifier, and duct on their own cadences, not a scramble the day before the fire inspection

You are a restaurant equipment maintenance engineer. Draft an
"Exhaust System Cleaning and Maintenance SOP" for a hotpot
restaurant, with the store's own technician as the owner. I will
give you: burner/pot count, daily trading hours, trading days
per week, number of hoods and fans, and the purifier's mounting
position. You backfill suggested ranges for each cadence tier
from those inputs (no fixed numbers) and keep every other clause
exactly as written.

Four components, each written by cadence tier:

Component 1 - Hood and filters
- Daily (after close): wipe the hood's outer shell and the
  burner-facing sides; check and empty the grease trough.
  Acceptance: bare hand on the shell comes away dry
- Weekly: remove hood filters, soak and wash (alkaline degreaser
  diluted per the product label - never self-mixed ratios),
  dry fully, reinstall. Acceptance: hold the filter to the
  light - mesh clear, no strands of grease
- Monthly: inspect the hood-to-duct joint for sealing and grease
  seepage; log and report any seep point

Component 2 - Grease purifier
- Weekly: check oil buildup and drips at the purifier's inlet
  and outlet, plus the pressure indicator or alarm light if
  fitted
- Monthly or on differential-pressure prompt: pull the
  electrostatic cells for cleaning -
  Safety red line (the single non-negotiable clause): main
  power off, "men working - do not switch on" tag hung, and
  the discharge wait run per the nameplate or manual; no
  manual means contact the manufacturer for one - never
  estimate from experience
- Post-wash acceptance: cells fully air-dried before reinstall;
  power on with no abnormal noise and no breaker trip; fill the
  cleaning log (date / who / next due)
- Outsourced deep-clean tier: set the range from the store's
  vapor load and local inspection practice; spell out the
  store's duties during outsourcing (power lockout, standby
  person, records kept)

Component 3 - Fan
- Weekly: listen for bearing noise, touch the housing for
  temperature, inspect belts (if fitted) for tension and wear
- Monthly: clear grease off the impeller and housing shell
  (power off), check vibration isolators and anchor bolts
- Rule: compare running current and sound against the last
  entry; a clear change is a repair ticket, not "run it and
  see"

Component 4 - Ductwork
- Monthly: inspect the grease around duct access panels and
  the visible interior - reach in, press a paper towel, read
  the stain
- Quarterly to semiannually: duct access check or cleaning
  (visible stretches in-house / long runs outsourced); fill
  the range from trading intensity
- Acceptance: no fresh seepage around access panels; paper
  towel pressed on visible interior comes away without a
  grease mark

General clauses:
- One consolidated log sheet: date / component / action / who /
  acceptance result / next due - hung beside the equipment
- Work at height or in confined runs goes in pairs; photo before
  and after
- This SOP cites no regulation clause numbers; where local
  inspection imposes specific requirements, follow the
  inspector's wording and fold it into the log sheet

Constraints:
- No "keep clean" or "check regularly" sentences without both a
  cadence and an acceptance test - every action carries the
  three elements: when, what, and how to pass
- Chemical cleaning says "per product label" only - no mixing
  ratios
- Electrical work on fans and purifiers goes as far as
  "contact the manufacturer / a licensed electrician" and stops
  - no live-work guidance
- Output one printable SOP, two pages maximum

Why it is written this way

Four components, four cadences, because they soil and clean at entirely different rates: a filter drips in two weeks and washes in half an hour; duct grease accrues on a quarterly clock and needs outside crews. Merge them into one monthly "exhaust maintenance" line and the schedule collapses onto the slowest component - the filter gets neglected alongside the duct until the grease hangs in strands. Tiering by component and backfilling each cadence accepts that one system runs at four tempos, and it is also what gives the light daily actions (wipe, empty the trough) any real chance of surviving inside closing routines.

Every acceptance test is a physical action (light, bare hand, paper towel) rather than an adjective like "clean," because that is what makes handover and outsourcing verifiable. For the in-house technician the test is self-check; for a contractor it is the acceptance sheet - "mesh clear, no grease strands" can be executed on the spot and turns "is it clean or not" from an argument into a look through the filter. Adjective acceptance produces disputes; physical tests produce records.

The purifier red line is the only non-negotiable clause in the document, and it exists precisely because it must be: electrostatic cells can hold residual charge after power-off, and estimating the discharge wait from experience is the textbook act of luck. Writing "per nameplate or manual; no manual means get one from the manufacturer" as a dead rule acknowledges the technician's real knowledge boundary - a dedicated technician will take anything apart, and the SOP's job is to stop the one time they shouldn't.

The single log sheet hung on the equipment pretends to be for inspectors but really serves the cadence itself: maintenance plans die not because nobody works but because nobody remembers when the last work happened. Hang the log next to the purifier's access door and the last date is right there when you open it - letting physical location do the remembering beats any reminder system.

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