How Often Should a Commercial Kitchen Hood Be Cleaned?

There is no single interval that fits every commercial kitchen. A busy, fry-heavy restaurant and a small café with light cooking can have very different hood-cleaning needs even if their hoods look similar. The right schedule comes from the cooking operation, the condition of the system and the requirements that apply to the premises.

Why hood cleaning frequency varies

Hood and canopy cleaning removes the grease that collects on surfaces, filters and accessible exhaust components. The faster that grease builds up, the more often the system needs attention. Several factors influence the rate of buildup:

• Cooking volume. More meals, longer service hours and continuous cooking generally mean more grease in the air.
• Cooking method. Grilling, frying and solid-fuel cooking can produce more grease or different types of residue than light preparation.
• Grease production. The type of food and equipment affects how quickly filters and surfaces load up.
• System condition and access. A system with damaged filters, poor airflow or hard-to-reach components may need more frequent attention.
• Local requirements. Your authority having jurisdiction (AHJ) may set requirements for your premises. Those requirements take priority over any general guidance.

What NFPA 96 Table 12.4 says

NFPA 96 is a widely referenced standard for commercial cooking ventilation. Its 2024 edition includes a table of cleaning frequencies that many operators use as a starting point:

• Monthly for solid-fuel cooking operations.
• Quarterly for high-volume cooking operations.
• Semiannually for moderate-volume cooking operations.
• Annually for low-volume cooking operations.

These intervals are general education, not a statement of Newfoundland law and not a guarantee that the same schedule fits your kitchen. Your AHJ decides what applies to your premises, and the condition of your system may call for a different interval. You can review the NFPA 96 2024 preview PDF for the source text.

Practical signs that the interval may be too long

• Visible grease on hood or canopy surfaces between scheduled visits.
• Filters that load up quickly or no longer fit properly.
• Persistent odours or grease deposits around the hood area.
• Service records that are missing or well out of date.
• Changes in cooking volume, menu or equipment that increase grease production.

None of these signs identifies a specific defect on its own. They are reasons to arrange an assessment and review the schedule.

Questions to ask when planning a schedule

• Which components are included in each visit, and which are excluded?
• How will access be handled for fans, roof areas and duct sections?
• What documentation will I receive after the cleaning?
• What interval do you recommend for this kitchen, and why?
• What should I watch for between visits?

Recordkeeping makes the schedule useful

A cleaning schedule is easier to manage when each visit produces a record. Keep the date, the components cleaned, any access limitations, visible observations and the recommended next step. Over time, those records show whether the interval is working or whether the kitchen's needs have changed.

When to request an assessment

Request an assessment if you are opening a new kitchen, changing your menu or cooking volume, moving into a new premises, or you cannot find recent service records. If you can see grease buildup or the system has not been serviced in a long time, do not wait for a calendar reminder.

Grease Shields provides commercial hood and canopy cleaning in St. John's and across the Island of Newfoundland. Learn about the hood cleaning service or request a quote.