Guide
Solid-fuel (wood/charcoal) hood cleaning — monthly reality check
Wood-fire pizza, charcoal grills, smokers, and pellet cookers put creosote and ash into the exhaust path on top of grease. Operators who keep a “quarterly hood clean” contract after adding solid fuel are usually on the wrong row of the inspection table — and creosote doesn’t wait for the calendar.
What changes with solid fuel
| Factor | Gas / electric line | Solid-fuel line |
|---|---|---|
| Inspection cadence (Table 12.4, secondary cite) | Quarterly / semi / annual by volume | Monthly |
| Deposit type | Mostly grease film | Grease + creosote + ash / soot |
| Ignition extras | Grease fire risk | Embers / sparks into ducts if spark arrestors missing or gapped |
| Filter reality | Baffle filters; staff clean on a set cadence | Listed spark-arrestor filters; often daily or multi-times-per-week staff cleaning |
| Cheap-wipe failure mode | Shiny canopy, dirty duct/fan | Same — plus creosote left in vertical runs and fan housing |
What a solid-fuel visit should cover
- Hood canopy, listed spark-arrestor filters (flush, no bypass gaps)
- Plenum, horizontal and vertical duct, access panels opened
- Rooftop fan interior + grease cup / containment
- Written note if any section stayed inaccessible
- Before/after photos of plenum, duct opening, fan — not only the canopy
Patterns that fail solid-fuel kitchens
- Keeping a quarterly contract after adding a wood oven or charcoal grill
- Standard baffle filters where spark arrestors are required
- “Couldn’t access” forever on vertical duct with no panel plan
- Staff never washing spark arrestors between professional visits
- Report with no creosote callout and no duct/fan photos
Field checklist this month
- Cooking type on the sticker logic — does your vendor schedule say monthly for the solid-fuel hood, or are you still on a restaurant-wide quarterly?
- Spark arrestors — listed for solid fuel, seated flush, cleaned by staff on a short cadence
- Ash handling — separate from grease waste; don’t treat ash dump as part of the hood-clean invoice without asking
- Access — enough panels to reach the runs that load with creosote
- Proof — service label date + report within the window your AHJ expects + path photos
Inspection vs cleaning (don’t blur the words)
Table 12.4 is an inspection schedule. Cleaning is required when measured deposits exceed the depth limits secondary sources attribute to NFPA 96 Section 12.6.1.1 (commonly cited: ~0.002 in on hoods/filters/fans/ducts). In solid-fuel kitchens, creosote plus grease usually crosses that line between monthly visits — so plan the budget as monthly full-system work unless your written inspection report says the system stayed under threshold.
Spark arrestors and Chapter 15 filter rules (secondary)
Monthly inspection is only half the solid-fuel problem. Secondary republishers of NFPA 96 (2024 ed.) Chapter 15 add equipment rules for grease-removal devices when wood, charcoal, or other solid fuel can throw sparks and embers into the exhaust path. Confirm the edition and section numbers your AHJ adopts before you rewrite a filter order.
| Requirement (secondary NFPA 96 excerpt) | Operator check on the line |
|---|---|
| §15.5.1 — grease removal devices constructed of steel or stainless steel, or otherwise approved for solid-fuel cooking | Do not stock lightweight / unlisted baffles on a solid-fuel hood; match listing to the appliance risk (see hood filters: clean vs replace) |
| §15.5.2 — where airborne sparks and embers can be generated, spark arrester devices shall be used prior to the grease removal device so sparks/embers do not enter the grease filter, hood, and duct | Confirm listed spark-arrestor arrangement (often diamond-pattern face) seated flush with no bypass gaps; staff wash cadence is usually daily or multi-times per week |
| §15.5.3 — filters a minimum of 4 ft (1.2 m) above the appliance cooking surface | Flag low-mounted banks when a wood oven or charcoal grill was added under an existing hood — that is an equipment/layout issue, not a wipe-day fix |
| Table 12.4 + Chapter 15 — solid-fuel systems on a monthly inspection floor; creosote + ash load vertical runs and fan housings fast | Budget full-path cleaning on most monthly visits; demand duct/fan photos and creosote callouts on the report (see grease depth thresholds and vertical duct sections that get skipped) |
Industry solid-fuel write-ups (Kitchen Guard and others) stress the same field pattern: missing or wrong spark arrestors, creosote left in vertical duct, and quarterly contracts after a wood oven was added. For concept-specific calendars, see BBQ / smokehouse creosote + grease notes and wood-fired pizza oven hood schedule. “Clean” still means the path was opened — not a canopy shine (see what bare metal clean means).
Who it’s for / not for
- For: BBQ, wood-fire pizza, charcoal / open-hearth concepts, multi-unit ops that just added solid fuel under an existing hood contract
- Not for: treating this page as a substitute for your AHJ’s adopted code edition, or assuming “IKECA certified” alone means the solid-fuel path was cleaned to bare metal
Sources
- HoodFilters — NFPA 96 excerpts (2024) (secondary; §15.5.1–15.5.3 solid-fuel grease-removal / spark arrester / 4 ft filter height; Table 12.4 monthly)
- Facilitec Southwest — NFPA 96 codes notes (secondary; Chapter 15 + Table 12.4 solid-fuel monthly framing)
- Facilitec Southwest — NFPA 96 frequency guide (secondary; Table 12.4 solid-fuel monthly; inspect vs clean)
- Kitchen Guard — solid fuel hood cleaning & spark arrestors (secondary; spark arrestor flush-fit and staff wash cadence notes)
- UpCodes — solid-fuel cooking operations (secondary code mirror; spark-arrester / filter-height framing — edition numbering may differ; verify AHJ text)
- Total Fire Protection — frequency summary (secondary)
Next step
Pull last month’s invoice. If the solid-fuel hood is still on a quarterly cadence, email the vendor for a monthly inspection/clean quote with spark-arrestor filter scope and duct/fan photos required on every visit.