Hood Cleaning Frequency by Cooking Type: The Complete NFPA 96 Equipment Guide

NFPA 96 does not set a single cleaning interval for all restaurants. Frequency is determined by what you cook and how much grease your equipment produces. Here is how to find the right interval for every piece of equipment in your kitchen.

How NFPA 96 Sets Cleaning Frequency

NFPA 96 — the national standard governing commercial kitchen exhaust systems — does not assign a single cleaning interval to all restaurants. Instead, it defines four frequency tiers based on the type and volume of cooking. The logic is simple: the more grease your equipment generates, the faster it accumulates in the exhaust system, and the more often cleaning is required to maintain a safe, compliant system.

Monthly Cleaning: Solid Fuel & High-Volume Operations

Monthly cleaning is the most frequent requirement and applies to the highest grease-generating operations. If your kitchen uses any of the following, you are in the monthly tier:

• Monthly
  Wood-burning ovens

  Combustion byproducts and wood grease accumulate rapidly — among the fastest grease loads in any commercial kitchen
• Monthly
  Charcoal and mesquite grills

  Solid fuel cooking generates heavy particulate and grease vapor output
• Monthly
  High-volume fryer banks

  Multiple fryers at continuous high output in a burger or fried chicken concept
• Monthly
  Wok cooking stations

  Extremely high-temperature wok cooking releases dense grease clouds that coat ductwork rapidly
• Monthly
  24-hour restaurant operations

  Continuous operation with no overnight cooling period allows no recovery time — grease accumulates without break
• Monthly
  High-production operations

  Any operation cooking at commercial scale for high seat counts or multiple service periods per day

Monthly cleaning may also be appropriate when visible grease accumulation is observed mid-cycle during a quarterly-scheduled service. A responsible technician will note this in the service report and recommend moving to monthly.

Quarterly Cleaning: Moderate Cooking Volume

Quarterly (every 3 months) is the most common interval for San Diego full-service restaurants. It applies to moderate cooking volume operations using standard gas or electric cooking equipment:

• Quarterly
  Gas ranges and burners

  Standard grease output for most full-service restaurant kitchens
• Quarterly
  Flat-top griddles

  Moderate grease production in typical diner, breakfast, or burger operations
• Quarterly
  Standard charbroilers (gas)

  Gas charbroilers produce significant grease output but generally fall in the quarterly range for moderate volume
• Quarterly
  Single fryer operations

  One or two fryers at normal production volume — not high-output continuous operations
• Quarterly
  Full-service restaurant kitchens

  The standard category for most San Diego sit-down restaurants with lunch and dinner service
• Quarterly
  Fast casual concepts

  Moderate cooking volume with standard gas or electric equipment
• Quarterly
  Hotel kitchens and banquet operations

  Variable volume but typically qualify for quarterly unless high-output events are frequent

Semi-Annual Cleaning: Low-Volume Operations

Every 6 months is appropriate for operations with genuinely low grease output and limited cooking hours. Misclassifying a moderate-volume kitchen as low-volume to extend intervals is a common compliance error.

• Semi-Annual
  School and institutional cafeterias

  Cooking occurs during limited hours (breakfast and lunch only), with reduced summer volume for seasonal facilities
• Semi-Annual
  Senior centers and assisted living kitchens

  Limited cooking hours and typically lower-grease menus
• Semi-Annual
  Church and community center kitchens

  Occasional use kitchens with low weekly cooking hours
• Semi-Annual
  Low-volume pizza ovens

  Deck ovens with primarily baked output and no high-grease frying operations
• Semi-Annual
  Seasonal operations

  Restaurants that close for part of the year — cleaning frequency applies to active operating periods

Annual Cleaning: Non-Grease Cooking Operations

Annual cleaning is reserved for facilities that produce minimal or no grease-laden vapor. These are relatively uncommon in commercial food service and require a certified assessment to confirm the classification is appropriate.

• →Facilities using only steamers, kettles, or high-temperature ovens without frying or grilling
• →Operations where cooking is limited to reheating pre-cooked food with no open-flame or high-grease production
• →Facilities that have undergone a professional assessment confirming minimal grease vapor output

Equipment-by-Equipment Frequency Reference

Use this as a quick reference. When in doubt, the higher-frequency tier applies — under-cleaning is a compliance violation.

Mixed Kitchens: What Governs the Interval?

Most commercial kitchens run multiple types of equipment under the same hood system. The rule: the entire exhaust system is cleaned on the interval required by the highest-output equipment present.

When to Clean Before Your Scheduled Date

Your scheduled interval is a minimum. These conditions warrant cleaning before the next scheduled date:

• →Visible grease dripping from hood filters or canopy interior during service
• →Grease found in the ductwork access areas between scheduled cleanings
• →Fire suppression system technician notes grease accumulation on nozzle heads
• →You added high-grease equipment (fryer, charbroiler, wok) since the last service
• →Your cooking volume significantly increased — new service hours, larger events, expanded menu
• →Fire marshal or health inspector notes grease accumulation during inspection

Frequently Asked Questions