Guide
Nightly filter cleaning by staff vs professional deep clean
Two different jobs share the word “clean.” Kitchen staff pull baffle filters at close and put them through a soak, sink, or dishwasher. A certified exhaust cleaner opens the plenum, duct access panels, and rooftop fan on the NFPA 96 inspection / cleaning cycle. Mixing them up is how kitchens get a shiny canopy, a greasy duct, and a failed reinspection. Section numbers below are secondary summaries of NFPA 96 (2024 framing). Buy or cite the edition your AHJ adopted; this is not the official text and not legal advice.
Short answer
Staff own removable grease filters, drip troughs, and weekly grease-drip containers (secondary §12.6.17). Secondary operator guidance treats filter washing as a daily-to-weekly kitchen task — not the professional’s job. Professional deep cleans (and the inspections that trigger them) belong to a properly trained, qualified, and certified person acceptable to the AHJ (secondary §12.4 / §12.6.1). Staff filter work keeps grease out of the duct between visits; it does not replace scheduled inspection or a full-system clean when thresholds are crossed. A filter wash sticker is not a duct/fan certificate.
Who owns which surface
| Surface / task | Usually staff | Usually certified cleaner |
|---|---|---|
| Removable baffle filters | Yes — pull, wash, dry, reinstall vertical | May exchange/soak as an add-on; not a substitute for duct/fan work |
| Grease trough / drip tray under filters | Yes — every filter cycle | Checked during professional visit |
| Hood exterior / visible cookline wipe | Yes — daily sanitation | Not the NFPA exhaust deep clean |
| Metal grease drip containers (fryer / rooftop) | Weekly inspect or empty (secondary §12.6.17) | Flags overflow / missing containment |
| Hood plenum above filters | No | Yes — professional clean when required |
| Duct interiors via access panels | No | Yes — secondary §12.6.1 contaminated portions |
| Exhaust fan / rooftop discharge | No (safety + lockout) | Yes |
| Service label, panel tags, written report | Keep on hood / file in binder | Produce after inspection/cleaning |
Staff filter wash — practical cadence
- Cool the line; shut the exhaust fan before pulling filters
- Busy / fryer / char lines: often daily at close; moderate volume: often weekly — secondary manufacturer and service guides use that volume-driven range, not a single NFPA calendar day for staff filters
- Hand wash (hot water + metal-safe degreaser), commercial dishwasher if the manufacturer allows for that material, or overnight soak tank — then rinse and dry fully before reinstall
- Avoid bleach / harsh alkalis that accelerate corrosion (HoodFilters handbook)
- Reinstall baffles vertical so grease drains into the trough — not sideways into gaps
- Inspect every wash for warp, corrosion, holes, loose rivets; bag damaged filters instead of forcing them back (see clean vs replace)
- Wipe the trough every cycle — a clean filter over a full trough still drips fuel into the plenum path
Staff + pro working together
- Filters washed on a written close checklist
- Damaged baffles replaced with listed stock
- Professional visit hits plenum, duct, fan
- Inspection cadence matches cooking volume (Table 12.4 secondary)
- Reports and hood label filed after each pro visit
False economy
- “We wash filters — we’re NFPA compliant”
- Canopy wipe sold as full-system clean
- Skipping pro visits because the hood looks shiny from the floor
- Leaving warped filters in place with light gaps
- Staff climbing the roof or opening duct panels without credential / lockout
Field note — why dirty filters make the next deep clean worse
- Secondary Facilitec guidance: filters that are not cleaned daily or weekly stop catching grease, send raw grease into the duct between professional visits, and accelerate threshold-crossing accumulation at the next inspection
- Secondary §12.6.1: when inspection finds contamination from grease-laden vapors, contaminated portions are cleaned by a properly trained, qualified, and certified person acceptable to the AHJ — kitchen experience alone is not that credential
- Secondary DIY vs professional framing: staff work is expected and meaningful; plenum / duct / fan / documentation chain are not staff jobs
- Table 12.4 sets inspection frequency by cooking volume; cleaning is triggered when depth thresholds are crossed — see inspection vs cleaning and grease depth thresholds
What “professional deep clean” means here
- Full path when required: hood interior / plenum, grease removal devices as scoped, ducts through access panels, fan, rooftop discharge — not canopy-only (see full-system vs canopy-only)
- Electrical lockout, non-flammable process chemicals, no coating left behind (secondary §12.6.3–12.6.8 framing)
- Service label on the hood + tags at opened panels + written report inside the two-week window (secondary documentation chain)
- Named certified tech — IKECA CECS / Phil Ackland-style credentials are common AHJ-accepted paths; verify the person, not a company logo
Who it’s for / not for
- For: kitchen managers writing close checklists; facilities leads explaining to ownership why filter labor and hood contracts are both budget lines; trainers onboarding new closers
- Not for: claiming staff wash satisfies §12.6.1 deep cleaning; designing a hood; quoting regional prices (Unknown without local bids)
Sources
- Facilitec Southwest — NFPA 96 codes reference (secondary; §6.1 filters as operator-side cadence; §12.4 / §12.6.1 qualified person; §12.6.17 weekly drip containers)
- Facilitec Southwest — DIY vs professional hood cleaning (secondary; staff filter / drip / wipe expectations vs certified plenum-duct-fan work)
- Facilitec Southwest — how often to clean (2026) (secondary; dirty filters accelerate next inspection load; Table 12.4 vs cleaning trigger)
- HoodFilters — Hood Filter Handbook (PDF) (manufacturer; hand wash / dishwasher / soak; no bleach; vertical baffles; replace on damage; daily–weekly cadence by volume)
- HoodFilters — NFPA 96 filter excerpts (secondary; listed filters / mesh notes)
- RBM Building Services — exhaust cleaning compliance notes (secondary; daily filter dishwasher / sink practice; staff surface work ≠ duct/fan professional clean)
- Gateway Cleaning — how to clean commercial hood filters (secondary; staff filter steps; filter wash ≠ full-system compliance)
Next step
Add “pull / wash / dry / reinstall filters + wipe trough” to tonight’s close sheet if it is not already there. Confirm the next professional inspection date matches your cooking-volume tier. If the last invoice was canopy-only, rebid with a full-system scope before the next fire walk.