Five Fire Systems, Five Records: A Fire Prevention Week Audit for Your Kitchen
The five fire systems in a commercial kitchen, the records each one leaves, and how to audit all five during Fire Prevention Week — from Cleaning Pros Plus, LLC.
Fire Prevention Week runs October 4–10, and if you run a commercial kitchen, this is the right moment to pull every tag, open every log, and ask a plain question: are all five of your fire systems current?
Most kitchen leaders think about one system at a time — usually whichever one just got serviced or whichever inspector just called. But a commercial kitchen carries five distinct fire systems, and they run on five different schedules, maintained by five different trades, each leaving its own record. A lapse in any one of them can create a gap that the others cannot cover.
Here is what those five systems are, what drives each interval, and what the record after each service should show.
System One: Kitchen Exhaust
This is the system we work on every day, so we will go into the most detail here.
The kitchen exhaust system — hood, plenum, duct, fan, rooftop grease containment — accumulates grease every time a burner fires. Grease is fuel. The more cooking volume a kitchen runs, and the heavier the cooking type (solid fuel, high-volume charbroiling, wok cooking on one end of the spectrum; light-use steam tables on the other), the faster grease accumulates inside the duct.
The standard that governs this — NFPA 96, the Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations — sets inspection intervals based on cooking type and volume. A high-volume solid-fuel operation gets inspected on a shorter cycle than a low-volume kitchen cooking light food. Those inspection intervals are the schedule for checking. Cleaning is triggered by what the inspection measures.
When we climb on a roof or drop into a plenum, we are not just looking for visible grease. We are measuring grease depth with a calibrated gauge. The standard expresses grease-depth thresholds in microns: 50 microns is the maximum acceptable residual left after cleaning; 2,000 microns is the accumulation that triggers cleaning on surfaces and devices; and 3,175 microns — roughly one-eighth of an inch — is the trigger in the fan housing. When we measure depth, we record the number. That number goes on the report. The report is what your insurance carrier, your fire marshal, and your landlord's attorney will ask for if something goes wrong.
After cleaning, the report should show before and after grease depth readings, the areas cleaned, the date, and the credentials of the technician and company that performed the work. Our crew includes PECT Designated Technicians. Cleaning Pros Plus is an IKECA member. Our founder holds CECS #200452 personally. We state what we hold and we let the record speak.
We have seen systems that were on a correct inspection schedule but had never been measured — just visually "checked" and signed off. Visual inspection alone does not produce a grease depth reading. A number on a gauge is not the same as an impression from a flashlight. The difference matters when there is a fire and an adjuster is reading the report.
System Two: Automatic Suppression
The suppression system — the Ansul or equivalent wet-chemical system mounted in the hood — is designed to discharge agent directly onto the cooking surface and into the plenum if it detects a fire. It has nozzles, a fusible link or detection line, a cylinder of agent, and a pull station.
This system is serviced by a licensed fire suppression contractor, not by the Kitchen Exhaust Cleaning crew. The service interval is set by the standard that governs commercial cooking suppression systems, and by the system manufacturer's requirements. Semi-annual service is the common interval, but the installed system's listing and your authority having jurisdiction set the controlling requirement.
The record after each service should show that the agent cylinder is within its service weight, the nozzles are properly aimed and unobstructed, the fusible links or detection line have been replaced on schedule, and the manual pull station is accessible and functional. The technician should tag the system and leave a written report.
One thing we check on every kitchen exhaust visit: whether the suppression nozzle caps are in place. Grease accumulation on nozzle caps is a duct-side problem we can photograph and flag. But we do not service the suppression system — we tell the kitchen leader what we saw and leave the suppression work to the qualified suppression contractor.
System Three: Automatic Sprinklers
Sprinklers protect the broader building. In most commercial kitchens, there are sprinkler heads in the dining room, back-of-house corridors, dry storage, and sometimes in the kitchen itself. The sprinkler system is entirely separate from the suppression system in the hood.
Sprinkler systems are tested and inspected under NFPA 25, the Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems. Intervals vary by component: visual inspection of sprinkler heads can be required quarterly; flow tests, main drain tests, and other procedures run on their own schedules. A licensed fire sprinkler contractor performs and records this work.
The record to look for is a current ITM (inspection, testing, and maintenance) report showing every test performed, the date, the technician's name and license, and any deficiencies noted. Deficiencies should have a correction date attached.
System Four: Fire Alarm
The fire alarm system — detectors, pull stations, control panel, notification devices — is tested under NFPA 72, the National Fire Alarm and Signaling Code. Annual testing is the baseline for most components, but specific devices and functions have their own intervals within that standard.
A licensed alarm contractor performs the test, documents every device tested, records pass or fail for each, and tags the panel. The record should be kept on site and available for inspection.
In commercial kitchens, the alarm system and the suppression system are often interconnected — a suppression system discharge can trigger an alarm signal, and a loss of power to the alarm panel can affect suppression monitoring. These interconnections should be tested together. Ask your alarm contractor and your suppression contractor whether they coordinate that test.
System Five: Portable Fire Extinguishers
Portable extinguishers are the last line of defense and the most frequently overlooked in terms of paperwork. They require monthly visual checks (which kitchen staff can perform) and annual maintenance by a licensed extinguisher service company. Every six years, the dry chemical inside must be emptied, inspected, and recharged. Every twelve years, the cylinder itself must be hydrostatically tested.
The record is the tag on the extinguisher and the service report from the annual maintenance visit. If the tag is missing, illegible, or dated more than twelve months ago, the extinguisher is out of compliance regardless of whether the gauge reads in the green.
In a commercial kitchen, the correct extinguisher class for the cooking area matters. A Class K extinguisher is specified for commercial cooking equipment. The presence of a dry chemical ABC extinguisher nearby does not substitute for a Class K unit at the cooking line. Verify that the right type is mounted in the right location.
The Record After a Fire
If a fire occurs in your kitchen, five things will happen in quick succession: the fire department will respond, the insurance carrier will send an adjuster, the health department may close the kitchen pending inspection, your landlord may invoke lease provisions, and an attorney may get involved. Every one of those parties will ask for documentation.
For each of the five systems, the question will be the same: when was it last serviced, by whom, what did they find, and what did they do about it?
A tag on the hood without a grease depth reading is not a complete record. A suppression system tag without a replacement date on the fusible link is not a complete record. A sprinkler ITM report that lists deficiencies without correction dates is not a complete record. Completeness is what matters when the question is whether the system was properly maintained before the fire.
The founder of Cleaning Pros Plus was retained as an NFPA 96 expert witness in a case involving kitchen exhaust documentation. The record the crew leaves after every service — grease depth readings, areas cleaned, before and after conditions — is built to hold up to that kind of scrutiny.
What to Do This Week
Pull the tag or report for each of the five systems. Check the date. Check whether the record includes the specific data that service requires — not just a signature, but measurements, test results, and deficiency notes. If anything is missing, expired, or unclear, call the contractor responsible for that system this week.
For Kitchen Exhaust Cleaning, we serve the Central Valley, the Bay Area and Northern California. If your exhaust system is due — or if you are not sure when it was last properly measured — reach out and we will get eyes on it.
Contact Us: cleaningprosplus.com/contact
About the Author
Arthur Haggerty is the founder of Cleaning Pros Plus, LLC and its family of companies — HoodOps and Stovio Advisors. He holds the Certified Exhaust Cleaning Specialist credential (CECS #200452), and Cleaning Pros Plus, LLC is an IKECA member. He has served as an expert witness in an NFPA 96 commercial kitchen fire case. Before founding Cleaning Pros Plus, he spent 25 years in enterprise IT and cybersecurity consulting, including a decade in IT audit and compliance and a tenure as CIO at Madera Community Hospital, and holds an M.S. in Information Technology. He is a ten-year U.S. Air Force veteran.