Kitchen Hood Suppression Requirements in NC

Who This Guide Is For

This guide is for restaurant owners, kitchen managers, franchise operators, and property managers with restaurant tenants in the Triangle. It also applies to any kitchen with commercial cooking equipment under a grease hood: churches, schools, senior centers, breweries, hotels, and catering kitchens.

If you lease your space, start with your lease. NFPA 17A, the standard these systems are built and serviced to, makes the system owner responsible for inspection and maintenance, and lets the owner hand that duty to a tenant or manager in writing. Raleigh's online reporting system treats it the same way: a restaurant's hood gets its own record, separate from the building's fire alarm and sprinkler records.

A note on scope: this guide covers the wet chemical suppression system that protects your hood, duct and cooking appliances. It also covers hood cleaning and Class K extinguishers, because a fire inspector checks all three on the same visit.

Three Kitchen Services That Run on Three Different Schedules

Most kitchens deal with three separate fire protection services, often from different companies. Mixing them up is one of the easiest ways to fall out of compliance.

Hood suppression system service: every six months, and after any discharge. A certified technician inspects and tests the system that sprays wet chemical onto the cooking line and shuts off the fuel. North Carolina Fire Code Section 904.12.6.2.
Hood and duct inspection and cleaning: on a schedule set by how you cook. A qualified person inspects the hood, filters, ducts and exhaust fan for grease buildup, and cleans them when grease has built up. North Carolina Fire Code Section 609.3.3.
Class K fire extinguisher: within 30 feet of the cooking line, serviced every year. The portable extinguisher made for cooking oil fires. North Carolina Fire Code Section 904.12.5 and NFPA 10.

Here is where kitchens get caught. The hood cleaning schedule depends on your cooking volume, so a church kitchen may only need its hood inspected once a year. That schedule does not apply to the suppression system. The North Carolina Office of State Fire Marshal said so in a written code interpretation in 2019: the cleaning table covers grease buildup in the hood and duct, and "does not discuss nor have any additional requirements for the hood fire suppression system." Every suppression system needs service at least every six months, no matter how little you cook.

The hood and duct inspection schedule from the North Carolina Fire Code, Table 609.3.3.1:

Solid fuel cooking (wood or charcoal): every month
High volume cooking (24-hour cooking, charbroiling, wok cooking): every 3 months
All other cooking operations: every 6 months
Low volume cooking (places of worship, seasonal businesses, senior centers): every 12 months

Hood and duct cleaning is often done by a separate hood cleaning company. Whoever does it must leave a tag on the hood with their company name, address, phone number and the date of service, and older tags must be covered or removed.

Why a Hood Suppression System Is Required in North Carolina

The North Carolina Fire Code requires an automatic fire-extinguishing system on every commercial kitchen exhaust hood and duct system that needs a Type I hood (Section 904.2.2). A Type I hood is the grease hood required over commercial cooking appliances that produce grease or smoke: fryers, griddles, charbroilers, ranges, woks and ovens used for that kind of cooking.

The code also sets what kind of system it has to be and what it has to do:

It must be tested to UL 300. Pre-engineered wet and dry chemical systems must be tested to UL 300 and listed for the job, and wet chemical systems are installed to NFPA 17A (Section 904.12).
It must shut off the fuel. When the system discharges, it must automatically shut off the gas or electric power to the cooking equipment under the hood, and that reset must be done by hand (Section 904.12.2). In Raleigh, the plans for a new or changed system must also show the make-up air and HVAC shutting down.
It must have a manual pull station in the right spot (more on that below).

The North Carolina Fire Code in force today is the 2018 edition. Enforcement is local. Inside Raleigh, that is the City of Raleigh Office of the Fire Marshal, and Durham, Cary, Apex, Wake Forest and Chapel Hill each have their own. Raleigh inspects restaurants every year. The state minimum for a restaurant with fewer than 100 occupants is once every three years, but Raleigh lists restaurants, clubs and places of entertainment under its one-year inspections.

Raleigh Requires Every Hood Report to Be Filed Online

This is the Raleigh requirement most restaurant owners have never heard of.

Under the City Code (Section 5-2047), every inspection, test and maintenance report for a fire protection system must be filed electronically in the city's reporting system, The Compliance Engine, within 15 days of the service. The Fire Marshal's office states that hood suppression reports must be submitted every six months. If anything fails, the City Code gives the owner 30 days to make the repairs, and the repair report is filed the same way. The state fire code adds its own version of the rule: after each service, a certificate of inspection goes to the fire code official (Section 904.12.6.2).

So a service that was done but never filed leaves the city with no record of it. When you choose a provider, ask whether they file the report for you and send you a copy.

What Happens During a Six-Month Service

NFPA 17A requires wet chemical systems to be serviced at least every six months and after any discharge, by a technician who has the manufacturer's manuals for that system. A complete service includes:

Checking that the cook line still matches the system. The technician confirms the appliances under the hood are the same ones, in the same positions, that the system was designed to protect. If anything has been swapped, added or moved, the system may no longer cover it (see the next section).
Examining every part of the system: the detectors, the agent cylinder and expellant gas, the releasing device, the piping, the nozzles and their blowoff caps, and the gas valve and electrical shutoffs.
Replacing the fusible links, the heat-sensing links in the hood that set the system off.
Testing the detection system, the release mechanism and the manual pull station to confirm they operate.
Confirming the fuel and power shut off, and that the make-up air or HVAC shuts down where it is connected.
Checking the fire alarm connection, where the system is tied into the building's fire alarm, so a discharge also sends an alarm signal.
Tagging the system with the month and year of service and who did it, removing the old tag, and giving you a written report.

Plan the service for a time the line is down, before opening or after close. NFPA 17A does not allow duct or fire chase panels to be opened for service while the protected appliances are running, and testing the system cuts the gas and power to the line.

Changed Your Cook Line? In Raleigh, That Needs a Permit

The nozzles in your hood are placed and aimed for specific appliances in specific positions. When the plans for a Raleigh system are submitted, they show every appliance from left to right, its height, and the location and height of every nozzle above it.

That is why the North Carolina Fire Code says that when the cooking media changes, cooking equipment is moved, or cooking equipment is replaced, the system has to be brought into compliance for the new setup (Section 904.12.6.1). Raleigh spells out what that means in its permit guide for fire protection systems:

"A change in cooking medium or appliance arrangement will require a construction permit and construction documents with a subsequent acceptance test and inspection by a Fire Marshal." (City of Raleigh, Fire Protection Permits and Inspections, Section 18.2)

These are all changes in appliance arrangement or cooking medium:

Replacing a griddle with a fryer, or a range with a charbroiler
Adding an appliance under the hood
Moving appliances to different positions on the line
Adding solid fuel cooking, such as a wood-fired oven or a smoker

Replacing an appliance with a similar one in the same spot still falls under the state rule above, because the system has to be checked against the new unit. Tell your provider before it happens and they can tell you whether that swap needs a permit.

In Raleigh, a fire code official must witness a full acceptance test of the new or changed system before it is used. The city's permit fee for installing or modifying a hood suppression system is $231 per system (City of Raleigh fee guide, July 2026 to June 2027).

The order matters. Call your suppression provider before the new equipment arrives, not after it is in place. A fryer pushed under a nozzle aimed at the griddle that used to be there is a fire the system may not put out.

The Monthly Check Your Staff Should Do

NFPA 17A requires a monthly inspection between professional services. It is a visual check that takes a few minutes, and someone on your staff can be trained to do it. Each month, confirm:

The system and its parts are in their proper place
Nothing blocks the manual pull station
The tamper seals and indicators are intact
The current service tag is on the system
Nothing is visibly damaged
The cylinder gauge, if there is one, reads in the normal range
The blowoff caps on the nozzles are in place
The cooking equipment under the hood has not been replaced, changed or moved

Write down the date and the initials of the person who checked, every month, and keep that log until the next six-month service. If anything is wrong, call your provider right away. The repair has to be made by a certified technician, not by staff.

Fusible Links: Once a Year or Every Six Months?

Fusible links are the small metal links in the hood that melt at a set temperature and set off the system. They hang in the hood above the cooking line, in the grease and heat, every day the kitchen runs.

The two rules that apply in North Carolina say different things:

The North Carolina Fire Code requires fusible links to be replaced at least once a year (Section 904.12.6.3). Glass bulb detectors are exempt from the yearly replacement.
NFPA 17A, the standard the code points to for wet chemical systems, requires metal alloy links and glass bulbs to be replaced at least every six months.

Replacing the links at every six-month service meets both rules. The year the link was made and the date it was installed are written on the service tag, so you and the fire inspector can see how old your links are.

After the System Goes Off

If your system discharges, from a fire or by accident, you cannot simply clean up and start cooking again.

The North Carolina Fire Code requires the system to be serviced after any activation (Section 904.12.6.2).
Under NFPA 17A, the system must be recharged, the piping flushed and blown clear, and the system returned to normal operating condition, following the manufacturer's manual.
The gas and electric shutoff has to be reset by hand (Section 904.12.2), which should be done as part of putting the system back in service.
The system gets a new tag, and in Raleigh the report is filed like any other service.

Until that is done, the cooking line under the hood has no working fire protection. Call your provider the same day.

The Manual Pull Station

Every hood suppression system needs a manual pull station so staff can set it off by hand. The North Carolina Fire Code sets exactly where it goes and how it works (Section 904.12.1):

At or near an exit path from the cooking area
Between 10 and 20 feet from the kitchen exhaust system
Mounted between 42 and 48 inches above the floor
Clearly labeled with the hazard it protects
It must take no more than 40 pounds of force and no more than 14 inches of pull to set off the system

When a kitchen gets rearranged, a sheet pan rack or a stack of boxes can end up in front of the pull station. Your monthly check includes making sure nothing blocks it.

Class K Fire Extinguishers

A hood suppression system does not replace a portable extinguisher. The North Carolina Fire Code requires a portable extinguisher within 30 feet of travel from commercial cooking equipment, and where you cook with oil, fat or solid fuel it must be a Class K (Section 904.12.5):

Deep fat fryers: one Class K extinguisher of at least 1.5 gallons for up to four fryers holding up to 80 pounds of oil each, plus one more for each additional group of four. Fryers larger than 6 square feet of surface follow the extinguisher manufacturer's recommendations.
Solid fuel appliances with fireboxes of 5 cubic feet or less: one 2.5-gallon or two 1.5-gallon Class K extinguishers.

NFPA 96 also requires a placard near each Class K extinguisher stating that the hood system must be activated before the extinguisher is used. Pulling the station first shuts off the gas or power under the hood and puts the system's agent on the cooking line. The extinguisher is the backup.

Class K extinguishers need professional service every year, like every other extinguisher in the building. See our fire extinguisher service page.

Records and Tags

Passing the service is half of compliance. You also have to be able to show it.

Service tag: each system carries a tag showing the month and year of the last service and who performed it. Only the current tag stays on.
Records on site: North Carolina requires inspection, testing and maintenance records to be kept on the premises, or another approved location, for at least three years (North Carolina Fire Code Section 107.3). Raleigh's City Code also requires three years on the premises.
Installation records: the original installation records, including who installed the system, its components and the manufacturer's operation and maintenance manuals, are kept for the life of the system (Section 901.6.2.1).
Raleigh: every report filed in The Compliance Engine within 15 days of the service.
Hood cleaning: its own tag on the hood and its own records, showing who did the work and when.
Every 12 years: the wet chemical cylinder, auxiliary pressure containers and hose assemblies need a hydrostatic pressure test under NFPA 17A. Your provider should track when it is due.

What a Fire Inspector Checks in Your Kitchen

On a Raleigh restaurant inspection, these are the items tied to the requirements in this guide:

A suppression service tag dated within the last six months
The service report filed with the city
Appliances under the hood that match what the system was designed and permitted for
Nozzle blowoff caps in place, and nozzles not bent out of position
A pull station that is reachable, labeled, and in the right location
A Class K extinguisher within 30 feet, with a current tag and the activation placard posted
A hood cleaning tag that is current for your type of cooking, and no visible grease buildup
Records on site for the last three years

Most of these happen between visits. A missing blowoff cap caught on a monthly check is a quick fix. Caught by the fire inspector, it is a deficiency on your inspection report.

Food Trucks

The North Carolina Fire Code in force today, the 2018 edition, has no section written for food trucks. The 2024 North Carolina Fire Code adds one: cooking equipment on a mobile food preparation vehicle must be protected by an automatic fire-extinguishing system, serviced every six months like a restaurant system. The 2024 code has been adopted but is not in effect yet, and the state licensing board's notice says it will not take effect before May 2027.

If your truck already has a system, NFPA 17A, the standard wet chemical systems are built and serviced to, calls for service at least every six months, the same as a restaurant. See our food truck fire suppression page.

Who Can Service a Kitchen Hood System in North Carolina

North Carolina does not issue a state license for kitchen hood suppression work. The state's fire sprinkler contractor license covers systems where water is the main extinguishing agent, which leaves out wet chemical systems, and North Carolina removed the fire code section that required certification of the people who service these systems.

That makes the provider's own qualifications the check that matters:

Manufacturer certification. NFPA 17A requires the technician to be trained, to have passed a written or online test, and to hold a certification document from the manufacturer or a testing organization. Systems from different manufacturers use different parts and procedures, so ask whether the technician is certified on your system's brand.
The manufacturer's manuals. NFPA 17A requires the technician servicing your system to have that manufacturer's design, installation and maintenance manual and service bulletins.
Raleigh permits. To install or change a system in Raleigh, the permit submittal must include the installer's training certificate from the system's manufacturer, or NICET Level III certification in special hazards along with the manufacturer's manuals.

When you choose a provider, ask:

Are your technicians certified on my system's brand?
Do you file my reports in The Compliance Engine?
Do you replace the fusible links at every service?
Will you handle the permit if I change my cook line?
Do I get a dated tag and a written report every time?

How to Stay Compliant Year After Year

A restaurant kitchen runs on a lot of inspection schedules at once: suppression service every six months, links every six months, hood cleaning on its own schedule, the Class K extinguisher every year, the monthly staff check, the fire alarm, emergency lighting, and a yearly fire marshal visit in Raleigh. Staff turns over, a manager leaves, and the six-month service slips to nine.

The simplest fix is one provider who tracks every date, calls you before each service is due, files the reports, and covers the hood system, the extinguishers, the fire alarm and the emergency lighting on one schedule. See how Zgoda Fire works with restaurants and commercial kitchens in the Triangle.

Call (919) 368-7464 to schedule your hood suppression inspection.

Schedule Your Hood Suppression Inspection - Call (919) 368-7464)

Frequently Asked Questions

Please reach us at chris@zgodafire.com if you cannot find an answer to your question.

How often does a kitchen hood suppression system need to be inspected in North Carolina?

At least every six months, and after any time the system discharges. That comes from North Carolina Fire Code Section 904.12.6.2 and NFPA 17A. Your staff should also do a short visual check every month and log it.

Is hood cleaning the same as hood suppression service?

No. Hood cleaning removes grease from the hood, filters and ducts, on a schedule from monthly to yearly depending on how you cook. Suppression service inspects and tests the fire system itself, every six months for every kitchen. The North Carolina Office of State Fire Marshal has stated in writing that the cleaning schedule does not apply to the suppression system.

Do I need a permit to move or replace a fryer in Raleigh?

Moving a fryer, or replacing it with a different type of appliance, changes the appliance arrangement, and Raleigh requires a construction permit, plans, and an acceptance test witnessed by a Fire Marshal for that. Even a like-for-like replacement has to be checked against the system under the state fire code. Call your suppression provider before the new equipment arrives.

How often should fusible links be replaced?

The North Carolina Fire Code requires at least once a year. NFPA 17A, the standard for wet chemical systems, requires metal alloy links to be replaced at least every six months. Replacing them at every six-month service meets both.

What do I do after my hood system goes off?

Do not cook on that line until the system has been serviced. It has to be recharged, the piping cleared, the fuel and power shutoff reset by hand, and the system re-tagged. In Raleigh, that service is reported to the city like any other.

How far can my Class K extinguisher be from the cooking line?

No more than 30 feet of travel from the commercial cooking equipment. Kitchens with several fryers may need more than one. A placard next to it should tell staff to activate the hood system first.

How often does the fire marshal inspect restaurants in Raleigh?

Every year. Raleigh lists restaurants under its one-year inspections. The state minimum for a restaurant with fewer than 100 occupants is every three years, so the schedule in other Triangle towns may differ.

Who is responsible for the hood system in a leased restaurant?

The system owner, unless the lease or a written agreement hands the responsibility to the tenant or a management company. Check your lease. Raleigh keeps a restaurant's hood as its own record, separate from the building's alarm and sprinkler systems.

Do food trucks need a hood suppression system in North Carolina?

The North Carolina Fire Code in force today has no food truck section. The 2024 North Carolina Fire Code requires one, with service every six months, once it takes effect, which the state licensing board says will not be before May 2027.

What areas does Zgoda Fire Protection serve?

Zgoda Fire Protection serves restaurants and commercial kitchens throughout the Triangle, including Raleigh, Durham, Chapel Hill, Cary, Apex and Wake Forest, plus surrounding communities.