A commercial kitchen fire starts in a fryer or on a range and is inside the duct within seconds. The suppression system in the hood is the only thing standing between that and the rest of the building — and it is the single most heavily inspected piece of equipment in a Chicago restaurant. We inspect, service and certify pre-engineered kitchen systems on the six-month cycle the code requires.
NFPA 96 and NFPA 17A require a pre-engineered kitchen suppression system to be inspected by a trained person every six months. Chicago enforces it, and a certificate showing the last inspection date is what a fire inspector, a health inspector and your insurer will each ask to see.
This is the failure we find most often, and it is almost always accidental. A pre-engineered system is designed around a specific layout — this nozzle over that fryer, that one over the char-broiler. Move an appliance, swap a six-burner range for a flat-top, or add a fryer at the end of the line, and the nozzles are now aimed at the wrong things.
The system will still fire. It will discharge into empty air over an appliance that has been moved, and leave the one that is burning uncovered. Any change to the cooking line means the system has to be re-engineered around the new layout — tell us when you are planning a change, not after the inspector has been.
Kitchens changed to vegetable-based cooking oils that burn much hotter than the animal fats they replaced, and the old dry chemical systems could not reliably put those fires out or stop them reigniting. UL 300 is the standard the industry moved to in response, and it requires a wet chemical agent.
If your kitchen still has a dry chemical hood system, it is not compliant, and most insurers will not write the policy. A UL 300 upgrade replaces the agent, cylinders, nozzles and detection — it is a real job, not a service call, and it is far better to plan it than to have a policy renewal blocked by it.
The hood system handles the fire automatically. The Class K wet chemical extinguisher on the wall is for the person dealing with what is left afterwards, and it must be within 30 feet of the cooking appliances. A kitchen needs both, and a sign at the pull station telling staff to activate the system before using the extinguisher.
Grease cleaning inside the hood, plenum and duct is a separate trade with its own licensing and its own schedule under NFPA 96, and we do not offer it. We service the suppression system inside the hood. If a cleaner has knocked a nozzle out of alignment or pulled a link during a clean, that is exactly the kind of thing our inspection catches — so it is worth booking the two close together, in that order.
From NFPA 96 and NFPA 17A. The suppression system and the extinguishers beside it run on different clocks.
| Interval | What happens | Who does it |
|---|---|---|
| Every 6 months | Full system inspection, fusible links replaced, new tag | Trained service company |
| Annually | Class K extinguisher maintenance and tag | Trained service company |
| Every 5 years | Hydrostatic test on Class K wet chemical cylinders | Licensed test facility |
| On any line change | System re-engineered to the new appliance layout | Trained service company |
| Monthly | Visual check of pull station access, nozzle caps and tags | Kitchen staff — recorded |
Every six months, by a trained service company, under NFPA 96 and NFPA 17A. The fusible links are replaced at each of those inspections, and the system gets a new dated certification tag. Chicago inspectors check the tag date, and an out-of-date tag is a straightforward violation.
UL 300 is the standard for wet chemical kitchen suppression, introduced because modern vegetable cooking oils burn hotter than the old dry chemical systems could handle. If your kitchen has a dry chemical hood system it is not UL 300 compliant, and most insurers now require the upgrade before they will renew.
Do not cook until it has been recharged and recertified. The cylinder is empty, the fusible links have gone, and the kitchen has no automatic protection at all. Call us and we will get the system back in service, replace the links and nozzles, and give you the paperwork your insurer will ask for.
Yes, and it is the most common reason a kitchen fails inspection. Nozzles are aimed at specific appliances in specific positions. Moving, adding or replacing an appliance means the system has to be re-engineered around the new layout. Tell us before the change and it is a planned visit rather than an emergency.
No — grease cleaning is a separate trade with its own licensing, and we do not offer it. We service the suppression system inside the hood. It is worth scheduling your cleaner first and our inspection afterwards, because cleaning is a common way for nozzles and links to get disturbed.
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1840 N Clybourn Ave · Chicago, IL 60614
