How Often Should Kitchen Hoods Be Cleaned?
Hood cleaning frequency depends on cooking volume and fuel type—not a fixed calendar. Learn how operators set intervals that match real grease load.
There is no single universal number of days that fits every kitchen. Hood cleaning frequency should track how much grease the operation produces and how the system is used—commonly framed around cooking volume and equipment type under standards such as NFPA 96, plus local rules.
If you only remember one principle: clean on grease load, not on habit alone.
Why “quarterly for everyone” fails
Two restaurants on the same street can need completely different intervals:
- A high-volume fry and charbroil line may load filters and ducts in weeks
- A light-sauté, low-grease menu may stay cleaner for months
Copying a neighbor’s schedule—or a generic vendor package—without looking at your cooking profile is how kitchens either overpay or under-protect.
Drivers that change frequency
Cooking volume
More tickets and longer fryer hours usually mean faster grease accumulation. Breakfast-all-day and late-night concepts often need tighter intervals than limited lunch service.
Fuel and menu
Solid-fuel and heavy charbroiling typically accelerate buildup. High-temperature oil frying is another common driver. Steaming and low-grease cookware produce less exhaust loading—but still need a program if a Type I hood is present.
System design and access
Long duct runs, undersized fans, poor capture, and limited access panels can hide grease deeper in the system. What looks acceptable at the canopy may already be overloaded upstream.
Prior findings
If inspections repeatedly flag duct grease shortly after cleaning, the interval—or the cleaning depth—is wrong.
A practical way to set your interval
- Baseline — Start from volume/fuel guidance your AHJ and NFPA 96-oriented practice expect
- Inspect — Photo-document canopy, filters, ducts, and fan after a known clean
- Measure drift — Re-check at mid-cycle; if grease returns early, shorten the interval
- Lock the calendar — Put cleaning and inspection on a shared schedule so records align
- Revisit after menu changes — New fryers or a wood-fire add-on resets the math
Signs you are overdue
- Filters drip or are heavily caked between swaps
- Strong grease odor at the roof or in the kitchen when idle
- Reduced capture (smoke rolling out at the hood face)
- Fan vibration or visible roof grease overflow
- Inspection findings that call for immediate cleaning
Cleaning frequency vs. daily care
Daily filter attention and wipe-downs support sanitation and capture. They do not replace scheduled deep cleaning of the exhaust path. Treat them as complementary layers.
Tie frequency to inspection
Cleaning removes fuel. Inspection proves whether the program is working. Pair:
- A written cleaning schedule matched to volume
- Inspection reports with findings and photos
- Corrective actions with due dates
See also the hood inspection checklist and grease buildup risks.
Bottom line
Ask “how greasy is this system getting, how fast?”—then set the calendar to stay ahead of that curve. Frequency is an engineering and compliance decision, not a marketing package.