How often should a commercial kitchen hood be cleaned?
There is no single interval for every commercial kitchen. Cooking fuel, cooking volume, hours, grease production, duct layout and the condition found during inspection all affect how quickly the exhaust system loads.
The practical frequency framework
Some solid-fuel and very high-volume operations may need monthly attention. Other kitchens commonly fall into quarterly, semiannual or annual cycles. Those are planning ranges, not a substitute for the current standard adopted by your authority having jurisdiction, your fire inspector or your insurer.
A calendar is useful only when the condition supports it. If the system is contaminated before the next date, the date is too late. If a vendor recommends a shorter interval, ask for photographs that show why.
What should change the interval
Contents
- Solid fuel, charbroiling, wok cooking and heavy fryer use
- Daily cooking volume and operating hours
- Grease found in the plenum, duct and rooftop fan
- Filter fit, condition and exchange frequency
- Duct length, turns and available access panels
- Roof grease or fan conditions that point to carryover
- Requirements from the fire authority, insurer, landlord or brand standard
Inspection and cleaning are not the same event
An inspection records the condition and whether cleaning is due. Cleaning removes the deposits from the agreed accessible scope. A dated service sticker does not prove every duct section was reached, so the supporting report should identify components and inaccessible areas.
Metro Nashville guidance says the entire exhaust system should be cleaned when contaminated with grease-laden deposits and says the service label should identify the date, company and areas not cleaned. Tennessee's mobile food inspection example checks that the hood is clean, tagged and labeled.
Build a record before guessing at the next date
Start with a documented baseline, then compare the same hood, plenum, access points and rooftop fan over time. Monthly filter-exchange photographs can help show how quickly the front of the system is loading between full cleans.
The final interval still belongs to the kitchen operator in coordination with the applicable authority and insurer. A cleaning company can document condition and recommend a schedule; it cannot approve its own work on behalf of an inspector.
Questions we get
Is every restaurant required to clean its hood every three months?
No single interval fits every kitchen. Quarterly is common for some operations, while solid-fuel or high-volume kitchens may need more frequent attention and low-volume systems may run longer. Confirm the adopted requirement with the applicable authority and insurer.
Does a monthly filter exchange replace full exhaust cleaning?
No. Filters are one part of the system. Exchange visits can slow loading and provide condition photographs, but they do not clean grease already in the plenum, duct or rooftop fan.
What are signs the current interval may be too long?
Visible deposits behind the filters, grease at duct access points, rooftop carryover, heavy fan buildup, repeated filter loading or an inspection finding are reasons to reassess the schedule.
Who has the final say on the cleaning interval?
The kitchen operator must follow the requirements of the applicable authority, adopted code, insurer, landlord and any brand standard. The cleaner documents condition and recommends an interval; it does not replace those authorities.
Sources and limits
- NFPA 96 standard development: Use the current adopted edition and confirm local application with the authority having jurisdiction.
- Metro Nashville vent hood cleaning procedures: Metro guidance covering the entire exhaust system, service labels, inaccessible areas and wastewater handling.
- Tennessee mobile food unit inspection example: A state inspection example that checks hood cleanliness, tags and labels; requirements vary by operation and jurisdiction.
Get a condition-based schedule
Tell us the hood and fan count and roughly when it was last cleaned. Photos of the hood, the filters and the rooftop fan speed the quote up considerably.