NFPA 96 Inspection Frequency: How Often Hoods Need to Be Cleaned and Inspected
NFPA-96 inspection is not one event — it's a layered schedule. Operators who treat it as a single "annual clean" get cited because the standard calls for different cadences at different points in the system's life: one inspection right after install, recurring grease cleans keyed to cooking volume, and a full-system inspection at fixed intervals.
1. Post-install commissioning inspection
Every new or substantially modified exhaust system gets one inspection before it goes into service. The system is clean from install — this isn't a clean. The inspector verifies the hood, duct, fan, and fire suppression were assembled to the listed design and that hood-face airflow meets the manufacturer's CFM spec. Confirmed by the install certificate and the AHJ's first-use sign-off, and triggers the start of the recurring cleaning clock.
2. Quarterly grease-cleaning interval (NFPA-96 §11.6)
The table every inspector works from is in NFPA-96 §11.6. It ties cleaning frequency to cooking volume and fuel type, not to a calendar:
| Cooking type | Cleaning interval |
|---|---|
| Solid-fuel (wood, charcoal, mesquite) | Monthly |
| High-volume gas — 24-hour, wok, stir-fry | Monthly |
| Moderate-volume gas | Every 3 months |
| Low-volume gas / electric | Every 6 months (annually in some jurisdictions) |
| Schools, churches, seasonal venues | Per cooking-type interval, prorated to days of operation |
The interval is measured from the last clean, not from the calendar year. A moderate-volume gas kitchen on a 90-day cycle cleaned March 15 is due again June 13 — not July 1. Missing it by a week is what triggers re-clean citations.
3. Semi-annual full-system inspection
Separate from cleaning, NFPA-96 calls for a full system inspection at intervals the AHJ sets — typically every 6 months for high-volume operations and annually for low-volume. This catches what cleaning doesn't: duct seam separation, fan hinge fatigue, missing access panels, and rooftop cap grease bleed-out. Every duct access panel is opened and inspected, the fan housing and rooftop termination are checked, and findings are recorded against the prior report so repeats get escalated.
4. What an inspector actually asks for
- Service record or work order for every clean in the prior 12 months, dated and signed.
- Compliance certificate (NFPA-96 sticker) on the hood, dated within the current interval.
- Fire suppression inspection (NFPA-17A) within the last 6 months — a separate citation if expired.
- Before-and-after photos from the most recent clean, matchable to the access points opened.
5. Putting it on a schedule
Anchor to the last clean date, not the calendar. For each customer, the next-clean date is a fixed offset from the previous one — 30, 90, or 180 days depending on cooking type. HoodKeeper schedules visits against that anchor, sends the service record email the same day, and drops the compliance certificate on the hood the same day. The AHJ sees a paper trail that matches the system on the wall.
The summary: one commissioning inspection at install, recurring grease cleans keyed to cooking volume (monthly, quarterly, or semi-annual), and a semi-annual full-system inspection. Miss any one of them and a perfectly clean kitchen still gets cited.