Commercial kitchens are the highest fire-risk occupancy most cities have, and the codes treat them that way. NFPA 96 requires the wet-chemical suppression system protecting your hood, ducts, and cooking appliances to be inspected and serviced every six months by a qualified company. Health inspectors and fire marshals both look at the tag — an expired one can shut your kitchen down on the spot.
What a semiannual visit covers
- Inspection of the wet-chemical cylinders, distribution piping, and nozzles (including nozzle caps, which keep grease out of the discharge path).
- Fusible link replacement — the heat-sensitive elements that trigger the system. These are consumables; they're replaced at every service.
- Verification of the manual pull station and the gas/electric shutoff interlock, so a discharge also kills the fuel source.
- A dated service tag on the system — your proof of compliance.
What UL 300 means for older kitchens
UL 300 is the fire-test standard modern wet-chemical systems are listed to, designed for the reality of high-efficiency fryers and hotter-burning oils. If your kitchen still runs an older dry-chemical system, expect pressure from two directions: insurers increasingly surcharge or decline them, and many AHJs require an upgrade at equipment changes. A UL 300 retrofit is a capital cost, but it's a one-time one — and it usually pays back through the insurance line.
Don't forget the Class K extinguisher
NFPA 10 requires a Class K portable extinguisher within 30 feet of the cooking appliances, as a supplement to the hood system — it's the backstop for a fire caught early. It rides the same annual extinguisher service cycle as the rest of your units.
Cost picture
Semiannual hood service typically runs $150–$400 per visit for a single-hood kitchen, scaling with hood count and system size. Fusible links and nozzle caps are inexpensive line items; cylinder recharges after a discharge cost more. As with all fire protection work, the bundle question is worth asking — many hood service companies also handle your extinguishers on the same visit.
One scheduling tip: book both annual visits at the start of the year. The single most common hood violation is simply a lapsed tag — the service is routine, but six months arrives faster than every restaurant expects. Our Compliance Calendar Builder includes the semiannual hood cycle, and the directory lists kitchen hood suppression companies by metro.