How often should a restaurant hood be cleaned?
Your hood cleaning frequency is determined by what you cook and how much you cook. NFPA 96 Table 11.4 provides the definitive answer:
| Type of Cooking Operation | Examples | Minimum Cleaning Frequency |
|---|---|---|
| Solid Fuel Cooking | Wood-burning pizza ovens, charcoal grills, mesquite smokers | Monthly |
| High-Volume Cooking | 24-hour restaurants, hospital kitchens, hotel banquet facilities, fast food chains | Quarterly |
| Moderate-Volume Cooking | Full-service restaurants, bar kitchens, most fast-casual | Semi-Annually |
| Low-Volume Cooking | Churches, day camps, senior centers, seasonal operations | Annually |
These are minimums. You may need to clean more often based on actual grease accumulation.
How do you determine which cleaning frequency category your restaurant falls into?
Monthly (Solid Fuel): If you use wood, charcoal, or mesquite in your cooking — including wood-fired pizza ovens, charcoal grills, and smokers. A BBQ restaurant in [Houston](/locations/houston-tx/) with smokers running all day falls into this category.
Quarterly (High-Volume): If your kitchen operates 12 or more hours per day, or if you run a fast food operation. A 24-hour diner or a casino kitchen in [Las Vegas](/locations/las-vegas-nv/) falls here.
Semi-Annual (Moderate-Volume): Most full-service restaurants fall into this category. If you're open for lunch and dinner with standard cooking operations, semi-annual cleaning is the minimum.
Annual (Low-Volume): Churches that cook for weekly events, seasonal camp kitchens, and senior centers with limited cooking.
When should you clean more often than the NFPA 96 minimum?
The NFPA 96 table provides minimums. Clean more often if:
- You notice visible grease accumulation on hoods or filters between cleanings
- Your cooking volume has increased (added shifts, extended hours, new menu items)
- You've changed cooking methods (added frying, grilling, or solid-fuel cooking)
- Your area has high humidity, which accelerates grease accumulation
- You've failed or barely passed a fire inspection
What happens if you don't clean your restaurant hood often enough?
Under-cleaning your exhaust system creates five serious risks:
- **Kitchen fire** — grease buildup is the #1 cause of commercial kitchen fires
- **Failed fire inspection** — your fire marshal will check cleaning documentation
- **Insurance denial** — your insurer may deny claims if you're not compliant
- **Health code violations** — some jurisdictions enforce exhaust cleaning under health codes
- **Higher cleaning costs** — heavily soiled systems take longer and cost more to clean
Do hood cleaning requirements vary by state?
Most states follow NFPA 96 directly, but enforcement varies. Some states have fire marshals who actively inspect and enforce cleaning intervals. Others rely on insurance company requirements to drive compliance. A few states, like Massachusetts, have additional certification requirements.
Check our [Cleaning Frequency Chart](/resources/cleaning-frequency-chart/) for a detailed reference and our [State Regulations pages](/resources/state-regulations/) for state-specific requirements.
What's the bottom line on hood cleaning frequency?
Know your category from the NFPA 96 table, schedule your cleanings in advance, and keep documentation on-site. If you're unsure about your category, err on the side of cleaning more often — it's cheaper than a failed inspection or a kitchen fire.
Pro Kitchen Services can help you determine the right cleaning schedule for your kitchen. [Get a free quote](/contact/) or call (888) 555-HOOD.
