How Often Should a Commercial Kitchen Hood Be Cleaned?

Cleaning schedules are not one-size-fits-all. Cooking volume, fuel type, and grease load change the risk. A qualified inspection should determine the right interval.

Utah’s State Fire Marshal publishes an inspection schedule that ranges from monthly to annually according to fuel type and cooking volume.[1] The interval is a starting point for inspection—not permission to ignore visible contamination until the next date arrives.

Utah’s published inspection schedule

Cooking operation	Inspection interval	Management implication
Solid-fuel cooking operations	Monthly	Treat as the highest-frequency category.
High-volume operations, including 24-hour cooking, charbroiling, or wok cooking	Quarterly	Review immediately after menu or volume changes.
Moderate-volume cooking operations	Semiannually	Do not assume six months is enough if grease appears sooner.
Low-volume operations, including churches, day camps, seasonal businesses, or senior centers	Annually	AHJ and actual system condition still control.

The essential distinction is simple: the schedule determines when the complete exhaust system should be inspected. If inspection finds contamination from grease-laden vapors, the contaminated portions must be cleaned by qualified personnel acceptable to the AHJ.[1][2] Actual conditions, local requirements, equipment instructions, or insurer requirements can justify a shorter interval.

What can move your kitchen into a shorter interval?

• A new charbroiler, wok range, smoker, fryer battery, or other equipment that increases grease production.

• Longer operating hours, late-night service, 24-hour cooking, or a significant rise in meal volume.

• Visible grease returning well before the scheduled inspection date.

• Smoke or heat escaping the hood, persistent grease odor, or weaker capture at the cooking line.

• A deficiency report, inaccessible duct section, damaged fan component, or missing access panel that was never corrected.

Inspection and cleaning are not interchangeable

An inspection determines condition and documents deficiencies. Cleaning removes contamination from the system. Washing filters and wiping the canopy are necessary housekeeping tasks, but they do not establish that the ductwork and fan are clean. Utah requires commercial kitchen exhaust inspection and cleaning companies to be licensed and technicians to be registered.[2]

The manager’s control check

1. Identify the cooking category that best matches the current operation—not the menu you had a year ago.

2. Locate the last service label, completion or deficiency report, and before-and-after photographs.

3. Confirm that all listed deficiencies were actually corrected and documented.

4. Ask whether menu, equipment, volume, or operating hours changed after the schedule was set.

5. Put the next inspection on the calendar before the current service file disappears into an inbox.

THE DANGEROUS SENTENCE

“We clean twice a year” is not proof that twice a year is correct. The correct schedule is the one supported by the cooking operation, the inspection findings, and the AHJ.

GET THE INTERVAL RIGHT BEFORE THE NEXT SHIFT ADDS MORE FUEL

Hive Industrial Services provides free inspections, full four-component hood exhaust cleaning, before-and-after photographs, reporting support, and recurring scheduling for Utah facilities. Call 801-866-5057 or book at hiveindustrialservices.com/contact.

Verified sources

[1] Utah State Fire Marshal. Kitchen Exhaust Duct Cleaning Maintenance — Monthly, quarterly, semiannual, and annual intervals; cleaning scope and owner documentation. Accessed July 22, 2026.

[2] Utah State Fire Marshal. Kitchen Exhaust Duct Cleaning Systems — Licensing, technician registration, completion/deficiency reporting, red tags, and AHJ notification. Accessed July 22, 2026.

[3] Utah State Fire Marshal. Laws & Rules — Lists NFPA 96 (2024 edition) for kitchen exhaust systems cleaning. Accessed July 22, 2026.

[4] Hive Industrial Services. Kitchen Hood Exhaust Cleaning — Current service scope, documentation, scheduling, and contact claims. Accessed July 22, 2026.

Scope note: The AHJ has final authority. The published schedule should not be read as a guarantee that a system can safely wait until the maximum interval when grease is already present.