How often does an Ansul system need to be inspected?

At least every six months by a trained, qualified technician, under NFPA 96 and NFPA 17A, plus a monthly visual check by the owner. Your local fire marshal can require more.

What does NFPA 17A require for kitchen suppression systems?

NFPA 17A is the standard for wet chemical extinguishing systems. It covers design, installation, monthly owner inspections, semi-annual maintenance by trained personnel, fusible link replacement, and hydrostatic testing of cylinders. NFPA 96 separately requires the kitchen system to be inspected and serviced at least every six months.

How long does a semi-annual inspection take?

A single-hood, single-cylinder system is often done in about an hour. Large kitchens with several systems take longer.

Who can perform the inspection?

A technician trained and authorized by the system manufacturer, working for a company that holds the license your state requires, such as a TDI registration in Texas or a State Fire Marshal Class D dealer license in Florida.

Ansul System Inspection Checklist: What Happens at the Semi-Annual Visit

Updated October 2026. General information, not legal advice. Your local fire marshal (AHJ) and the system manufacturer's manual control.

Commercial kitchen wet-chemical suppression systems get two kinds of checks. The owner or manager does a quick visual check every month. A trained, qualified technician inspects and services the system at least every six months, following NFPA 17A (the wet chemical extinguishing system standard), NFPA 96 (commercial cooking ventilation), and the manufacturer’s installation and maintenance manual.

This checklist applies to Ansul R-102 and Piranha, Kidde WHDR, Amerex KP, Range Guard, Buckeye, and Pyro-Chem systems. The exact steps come from each manufacturer’s manual.

Monthly owner check (you, not the technician)

NFPA 17A asks the owner to check the system monthly. It takes a couple of minutes:

The system is in its normal position and nothing has been discharged.
The manual pull station is unobstructed and its tamper seal is intact.
The current inspection tag is in place and not past its due date.
If the cylinder has a pressure gauge, it reads in the operable range.
Nozzle blow-off caps are in place and nozzles are not covered in grease.
Cooking appliances have not been moved, swapped, or added under the hood.
Write down the date and your initials, or keep a log.

Semi-annual technician inspection checklist

Confirm the hazard has not changed: appliance types and positions still match the nozzle layout the system was designed for.
Inspect the agent cylinder(s): mounting, physical condition, gauge, and nameplate.
Check the expellant cartridge (on cartridge-operated systems) by weight or as the manual directs.
Inspect the detection line, pulleys, and conduit, and replace fusible links as the manufacturer and NFPA 17A require.
Trip the system from the detection line and the remote manual pull station (with the agent isolated) to prove the release mechanism works.
Verify the gas shutoff valve closes and any electric shunt trip de-energizes the cooking appliances on release.
Verify any fire alarm interconnect signals the panel.
Inspect nozzles: correct type, aimed at the appliances, clean, caps in place.
Check the piping and hood/duct penetrations for damage.
Confirm a Class K portable extinguisher is in the kitchen.
Reset the system, seal the pull station, attach a new dated tag, and leave a written report listing any deficiencies.

Longer-interval items

Hydrostatic testing of wet-chemical agent cylinders at 12-year intervals.
Recharge after any discharge, and a full inspection after the system is put back in service.
System modification or replacement when appliances change or the system is no longer supported by the manufacturer. Many fire marshals expect systems to meet UL 300.

How to prepare for the visit

Schedule outside peak service. The technician needs the appliances cool and the line reachable.
Have the last inspection report ready, and photos of the cylinder nameplate if it is a new vendor.
Know where the gas shutoff and the electrical panel are.
Clear access to the cylinder cabinet and the pull station.
If the hood is heavily greased, schedule hood cleaning separately. A dirty hood can be written up.

Find a licensed inspector by city

HoodInspect lists wet-chemical kitchen suppression inspectors (not hood cleaners) in Dallas, Houston, Austin, Atlanta, Miami, New York City, Los Angeles, San Diego, Chicago, Phoenix, Washington DC, Philadelphia, and Denver.

Frequently asked questions

How often does an Ansul system need to be inspected?: At least every six months by a trained, qualified technician, under NFPA 96 and NFPA 17A, plus a monthly visual check by the owner. Your local fire marshal can require more.
What does NFPA 17A require for kitchen suppression systems?: NFPA 17A is the standard for wet chemical extinguishing systems. It covers design, installation, monthly owner inspections, semi-annual maintenance by trained personnel, fusible link replacement, and hydrostatic testing of cylinders. NFPA 96 separately requires the kitchen system to be inspected and serviced at least every six months.
How long does a semi-annual inspection take?: A single-hood, single-cylinder system is often done in about an hour. Large kitchens with several systems take longer.
Who can perform the inspection?: A technician trained and authorized by the system manufacturer, working for a company that holds the license your state requires, such as a TDI registration in Texas or a State Fire Marshal Class D dealer license in Florida.

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