5 Signs Your Commercial Kitchen Hood Needs Cleaning Now

Most commercial kitchens clean their exhaust hoods on a regular schedule — but grease buildup doesn’t always wait politely for the next appointment. Here are the real warning signs that your system needs attention sooner rather than later.

1. Weaker airflow than usual

If your kitchen feels hotter, smokier, or stuffier than it used to, your exhaust system may not be pulling air the way it’s designed to. Grease buildup inside the ductwork restricts airflow gradually, so the change can be easy to miss day-to-day until it’s significant.

2. Smoke or odor that lingers

A properly functioning exhaust system clears smoke and cooking odors quickly. If smoke hangs in the air longer than it used to, or grease smell lingers well after close, that’s a sign the system isn’t venting efficiently.

3. Visible grease buildup or dripping

Grease that’s visibly pooling on the hood surface, dripping from the plenum, or staining the wall behind cooking equipment means buildup has already progressed past a light coating.

4. It’s been longer than your NFPA 96 tier allows

NFPA 96 sets cleaning frequency based on cooking volume — monthly for solid-fuel operations, quarterly for high-volume kitchens, semi-annually for moderate volume, and annually for low-volume operations. See our full breakdown of NFPA 96 cleaning frequency if you’re not sure which tier applies to your kitchen.

5. A fire inspector or insurance carrier flagged it

If a fire marshal’s visit or an insurance inspection noted grease buildup, that’s not a suggestion — it’s a citation risk that needs to be corrected on a real timeline, with documentation to show it was addressed. Our fire safety compliance consulting service can help you get ahead of that.

What to do next

None of these signs mean panic, but they do mean it’s worth having a professional cleaning crew take a look — including the parts of the system you can’t see from the kitchen floor, like the ductwork and rooftop fan, where grease tends to build up fastest. Request a free quote and we’ll help you figure out where your kitchen actually stands.