It is the question every restaurant owner eventually asks: how often does our exhaust hood really need a professional cleaning? The honest answer is that there is no single number that fits every kitchen. The right interval depends on how hard your kitchen works and what comes off your cooking line.
What the code actually requires
NFPA-96, the national standard for commercial kitchen ventilation, ties cleaning frequency to cooking volume rather than the calendar. Inspectors and insurers in Middle Tennessee use these intervals as the baseline for a compliant system.
- Monthly: high-volume operations and solid-fuel cooking such as wood or charcoal.
- Quarterly: most full-service restaurants with moderate to heavy cooking.
- Semi-annually: lighter-volume kitchens with limited fryer and grill use.
- Annually: very low-volume sites such as churches, seasonal venues, and day camps.
Why two restaurants on the same block need different schedules
A barbecue joint running a smoker and a fry station produces far more airborne grease than a cafe plating salads and espresso. The first kitchen may need monthly service to stay safe and compliant; the second may be fine on a quarterly cycle. Cooking method, hours of operation, and menu all push the real-world interval up or down.
The cost of waiting too long
Letting grease accumulate does more than create a fire hazard. It strains your exhaust fan, drives up energy use, lets odors and smoke linger in the dining room, and can void insurance coverage if a claim is ever filed against an undocumented system. A failed inspection can also mean fines or a forced closure during your busiest week.
How we set the right interval for your kitchen
We start with a walkthrough and a look inside the system, not just at the filters. Based on what we find and how you cook, we recommend a documented schedule, clean the entire system from hood to rooftop fan, and submit the paperwork your fire marshal expects. The goal is simple: a system that stays safe between visits and never gives an inspector a reason to pause.