NFPA 96 Cleaning Frequency in Ontario: What the Code Actually Requires

Every hood cleaning contractor in Toronto quotes the same table: monthly, quarterly, semi-annually, annually. Most of them quote it wrong, and the way they are wrong happens to sell more cleanings.

This page sets out what NFPA 96 and the Ontario Fire Code actually require, with the edition and section numbers, including the parts that do not help us commercially.

General information, not a compliance opinion on your specific system. The authority having jurisdiction, in Toronto the Chief Fire Official through Toronto Fire Services, is the one whose interpretation binds you.

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Start here: Ontario is on the 2014 edition

This is the first thing almost nobody gets right, and everything else depends on it.

The Ontario Fire Code, O. Reg. 213/07 under the Fire Protection and Prevention Act, 1997 says at Article 2.6.1.12(1) that a cooking operation producing smoke or grease-laden vapours shall be provided with an exhaust and fire protection system "in accordance with NFPA 96." Article 2.6.1.13 requires those systems to be maintained in accordance with NFPA 96.

Article 1.2.1.1(1) then says a reference in the Code is to "the edition designated in the table", and Table 1.2.1.A designates NFPA 96-2014.

So in Ontario the binding document is the 2014 edition, not the current 2024 one. The correct citation for the frequency table here is Section 11.4 / Table 11.4. If a contractor cites you "Section 12.4," they are quoting an edition Ontario has not adopted. The chapter was renumbered from 11 to 12 in 2021.

The table, and what it is a table of

NFPA 96-2014, Section 11.4: "The entire exhaust system shall be inspected for grease buildup by a properly trained, qualified, and certified person(s) acceptable to the authority having jurisdiction and in accordance with Table 11.4."

Type or volume of cooking	Inspection frequency	Typical operations
Solid fuel cooking operations	Monthly	Wood-fired ovens, charcoal grills, tandoor
High-volume cooking operations	Quarterly	24-hour cooking, charbroiling, wok cooking
Moderate-volume cooking operations	Semiannually	Most sit-down and quick-service kitchens
Low-volume cooking operations	Annually	Churches, day camps, seasonal businesses, senior centres

The "typical operations" column reproduces the standard’s own footnotes for the solid fuel, high-volume and low-volume rows. The moderate-volume description is ours.

Read the section heading again. It is a schedule of inspection, not a schedule of cleaning.

That is the thing nearly every contractor website in this market gets wrong, including ours, until we went back to the primary sources. Which is part of why this page exists.

So when does it actually have to be cleaned?

When it is dirty enough. That is the honest answer, and the standard says it in these words.

NFPA 96-2014, Section 11.6.2: "Hoods, grease removal devices, fans, ducts, and other appurtenances shall be cleaned to remove combustible contaminants prior to surfaces becoming heavily contaminated with grease or oily sludge."

Cleaning is condition-triggered, not calendar-triggered. The inspection tells you whether the trigger has been reached.

The measurement

The standard’s method for "how contaminated is too contaminated" is a grease depth gauge comb, a tool pressed into the deposit to read its thickness. In the 2014 edition Ontario adopts, this appears as annex guidance; it moved into the body of the standard in 2017. The current 2024 edition states the triggers as measurements:

0.078 in. (2000 μm) of measured depth on system surfaces
0.125 in. (3175 μm) measured in a fan housing

We cite those from the 2024 edition and label them as such, because being precise about where a number comes from is the whole point of a page like this. In Ontario the enforceable requirement is the 2014 wording; the depth measurements are the industry’s accepted method of deciding when that point has arrived.

What this means in practice

For a busy charbroil or wok line, the quarterly inspection will nearly always find the system over the trigger. For a solid-fuel operation the monthly inspection nearly always will. So in practice the cleaning schedule usually ends up looking like the inspection table, which is why the shorthand persists.

But the shorthand costs you something. It means nobody ever measures, which means nobody ever tells you your kitchen is quieter than the interval you are paying for. A restaurant that dropped its lunch service, a seasonal patio kitchen, an office cafeteria running four days a week: all can often go longer, and would never find out from a contractor who treats the table as a billing schedule.

The correct version: inspect on the code’s interval, measure, and clean when the measurement says to. If the answer is "not yet," that belongs in the report.

"Cleaned to bare metal" is not in NFPA 96

You will see this everywhere, usually as "NFPA 96 requires cleaning to bare metal."

The phrase has not appeared in NFPA 96 for roughly two decades. It is not in the 2014 edition and not in the 2024 edition. What the standard requires is that surfaces be cleaned to remove combustible contaminants, with the current edition specifying a residual film of 0.002 in. (50 μm).

We clean to bare metal anyway. Not because a code says so, but because "remove the combustible contaminants" is a threshold and bare metal is the only outcome you can verify in a photograph. A duct interior with a thin uniform film and one that is genuinely clean look different in a picture, and a picture is what your insurer will eventually ask for.

If a contractor tells you the code requires bare metal, they are repeating something from another contractor’s website. It does not make them a bad cleaner. It does tell you they have not read the standard.

What NFPA 96 requires you to be given

This is the part most operators have never seen, and the part that matters when something goes wrong.

§11.6.13: a certificate kept on the premises showing the name of the servicing company, the name of the person who performed the work, and the date.

§11.6.14: after cleaning or inspection, the cleaning company and the person performing the work "shall provide the owner of the system with a written report that also specifies areas that were inaccessible or not cleaned."

§11.6.10: when an access panel is removed, a service label or tag with the company name and the date must be affixed near that panel.

§11.6.15: where required, certificates and reports of areas not cleaned must be submitted to the authority having jurisdiction.

The inaccessible-areas report is the one nobody gets. Most operators have never been handed a document saying "we could not reach this section of duct." It is a requirement, not a courtesy, and its absence is the clearest single indicator that a contractor is not working to the standard. If you have never received one, ask for the last one. The answer will tell you a lot.

The standard does not treat inaccessible sections as excused. It requires them documented, and requires the inspection itself to assess whether access is adequate. An unreachable duct run is a finding that should lead to access panels being installed, not a permanent exemption.

Ontario adds its own record rule, and it is shorter than you have been told

Fire Code 1.1.2.1(1): where the Code requires tests, corrective measures or operational procedures, "records shall be made noting what was done and the date and time it was done." 1.1.2.1(3): those records "shall be retained at the building premises for examination by the Chief Fire Official." 1.1.2.1(4): electronic records that can be made readily available on request are deemed to comply.

1.1.2.2(1): records must be retained at least two years, and "at least the most recent and the immediately preceding record" of a given test or inspection must be kept.

Two years, plus always the last two records, kept at the building, electronic acceptable. You will see "three years" published by contractors in this market. That is the Massachusetts rule, not Ontario’s.

Who is responsible, and why property managers should read this bit

NFPA 96 places responsibility for the system on the equipment owner, and permits that responsibility to transfer to the operator or management firm only through specific provisions in the lease, written use agreement, or management contract.

In other words: in a landlord–tenant commercial arrangement, responsibility does not shift by custom, by invoice history, or by whoever happened to book the last cleaning. It shifts by written agreement or it does not shift at all.

If you manage a plaza with five restaurant tenants, it is worth knowing which of those leases actually says so. It is a common gap, and it surfaces at exactly the worst moment.

What enforcement looks like in Toronto

Toronto Fire Services, Fire Prevention Division enforces the Ontario Fire Code within the city, under the Chief Fire Official. The Office of the Fire Marshal sits above the municipality provincially.

We could find no published statement from Toronto Fire Services of a routine inspection cycle for restaurants. The City does state it responds to 100% of complaints and requests for Fire Code inspections, and publishes mandatory cycles for vulnerable occupancies. In practice most restaurant inspections in Toronto are complaint-driven, request-driven, or triggered by licensing, the most common scheduled touchpoint being the liquor licence inspection, listed on the City’s fee schedule at $339.54 as of 1 April 2026. Re-inspections are billed hourly: $113.17 inspector, $136.82 captain, $157.13 district chief.

The penalties are larger than most operators realise

Under the Fire Protection and Prevention Act, 1997, s. 28(3), an individual convicted is liable to a fine of not more than $50,000 for a first offence and $100,000 for a subsequent offence, or up to one year’s imprisonment, or both. s. 28(4): a corporation is liable to not more than $500,000 first offence and $1,500,000 subsequent.

s. 28(5) is the one nobody mentions: a director or officer of a corporation who knows that the corporation is violating the fire code is guilty of an offence and liable to a fine of not more than $50,000 for a first offence and $100,000 for a subsequent one, or up to a year’s imprisonment, or both. Personal liability, for knowing about it.

s. 30: failure to comply with an inspection order carries a fine of not more than $20,000 for every day the default continues, and paying it does not relieve you of the order.

And s. 27.1: an offence counts as "subsequent" if there is any previous conviction under the Act or regulations, "regardless of whether the offence that resulted in the previous conviction is based on a contravention of the same provision." An unrelated prior Fire Code conviction, anything at all from any part of the building, escalates a grease-related charge to the higher tier.

The insurance side, stated carefully

We are not going to give you a claims-denial statistic, because we looked for a credible Canadian one and there is no published figure we would stand behind. Every number circulating on contractor websites traces back to other contractor websites.

What we can tell you is the mechanism. Many commercial property policies attach a protective safeguards condition, a clause requiring the insured to keep specified fire protection systems in working order. Where such a condition applies and is breached, the effect is not a higher premium at renewal; it is that the policy may not respond to fire loss at all. The insurance-industry publisher IRMI notes that US courts have applied these clauses without requiring that the breach caused the fire.

Forms differ in Canada and we have not verified an equivalent standard Canadian wording. The practical advice is to ask your broker directly whether your policy carries a protective safeguards condition and what it requires of your kitchen exhaust system. Five-minute question, large answer.

For context on the underlying risk, the most recent published NFPA analysis of Structure Fires in Eating and Drinking Establishments (Campbell, 2017, using 2010–2014 US data) reports an annual average of 7,410 structure fires, of which 61% involved cooking equipment, causing $165 million in direct property damage. That is US data and over a decade old, so we are labelling it that way rather than presenting it as current or Canadian.

The other intervals people forget

Kitchen exhaust cleaning is not the only recurring obligation NFPA 96 creates. The ones that most often lapse:

Fire-extinguishing system maintenance: at least every six months, by trained, qualified, certified persons
Metal-alloy fusible links in the suppression system: replaced at least semi-annually
Fusible links on fire damper assemblies: at least semi-annually
Bulb-type sprinklers and non-metal-alloy links: examined and cleaned or replaced annually
Cooking equipment: inspected and serviced at least annually
Grease drip containers: inspected or emptied at least weekly
Employee training on manual suppression actuation and extinguisher use: on hiring and annually thereafter, with records kept

The suppression service is the one that catches people out, because it is usually a different vendor on a different schedule, and a lapsed link inspection is an easy finding for an inspector standing in your kitchen.

Kitchen hood cleaning across the GTA

We inspect and clean commercial kitchen exhaust systems across Toronto and the GTA, overnight, with photo documentation and a written certificate on every job:

Kitchen hood cleaning in Toronto · Mississauga · Brampton · Vaughan · Markham · All service areas

Frequently asked questions

How often does NFPA 96 require my hood to be cleaned?

It does not set a cleaning interval. Table 11.4 sets how often the system must be inspected for grease buildup: monthly for solid fuel, quarterly for high volume, semi-annually for moderate volume, annually for low volume. Cleaning is required when inspection finds the system contaminated, before surfaces become heavily contaminated with grease. In busy kitchens the cleaning schedule usually ends up matching the inspection interval, but they are two different requirements.

What counts as high-volume cooking?

NFPA 96’s footnote to Table 11.4 gives three examples: 24-hour cooking, charbroiling, and wok cooking. You will see other definitions quoted, such as "16 or more hours per day," that are not in the standard. If you are not sure which category your kitchen falls into, that is exactly what a walkthrough determines.

Which edition of NFPA 96 applies in Ontario?

The 2014 edition. Ontario Fire Code Table 1.2.1.A designates NFPA 96-2014 for Articles 2.6.1.12(1) and 2.6.1.13. That means the frequency table is Section 11.4 in Ontario, not Section 12.4. Section 12.4 is the renumbered equivalent in the 2021 and 2024 editions, which Ontario has not adopted.

Does NFPA 96 require cleaning to bare metal?

No. That language has been out of the standard for around twenty years. NFPA 96 requires surfaces to be cleaned to remove combustible contaminants; the current edition specifies a residual film of 0.002 in. (50 μm). Bare metal is a service standard some contractors, including us, hold themselves to. It is not the code’s wording.

How long do I have to keep my cleaning records in Ontario?

Ontario Fire Code 1.1.2.2 requires records to be kept for at least two years, and always at least the most recent and the immediately preceding record. They must be retained at the building premises, and 1.1.2.1(4) confirms electronic records are acceptable if they can be made readily available to the Chief Fire Official on request.

What documents should my hood cleaning contractor give me?

Under NFPA 96-2014: a certificate kept on the premises showing the servicing company, the person who performed the work, and the date; a written report specifying areas that were inaccessible or not cleaned; and a service label or tag near any access panel that was removed. The inaccessible-areas report is the one most operators have never received.

Who is responsible in a leased restaurant, the landlord or the tenant?

NFPA 96 places responsibility on the equipment owner, and allows it to transfer to the operator or management firm only through specific provisions in the lease, written use agreement, or management contract. It does not transfer by habit or by who booked the last cleaning. If you are a property manager, it is worth checking what your leases actually say.

What are the penalties for non-compliance in Ontario?

Under the Fire Protection and Prevention Act, an individual can be fined up to $50,000 for a first offence and $100,000 for a subsequent one, or imprisoned for up to a year. A corporation faces up to $500,000 and $1,500,000. A director or officer who knows of a violation is personally liable up to $50,000 and up to a year’s imprisonment. Failing to comply with an inspection order carries up to $20,000 per day. And any prior Fire Code conviction, even on an unrelated provision, escalates a later offence to the subsequent tier.

Can you tell me which category my kitchen falls into?

Yes, and there is no charge for it. The on-site evaluation looks at your cookline, the hood and filters, the duct run and access, and the fan and roof condition, and gives you a recommended inspection interval based on how your kitchen actually cooks. If you are currently on a shorter interval than your kitchen needs, we will tell you that.

Not sure which tier your kitchen is in?

We will come and tell you, for free. Fifteen minutes on site gets you an exact scope, a firm price, and a service interval based on how your kitchen actually cooks, not on what suits our schedule.

Book Your Free On-Site Evaluation · Or call 647-749-0045 and speak with the owner.

Sources: Ontario Fire Code, O. Reg. 213/07 (Articles 1.1.2.1, 1.1.2.2, 1.2.1.1, Table 1.2.1.A, 2.6.1.12, 2.6.1.13); Fire Protection and Prevention Act, 1997 (ss. 27.1, 28, 30); NFPA 96, Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations, 2014 and 2024 editions; City of Toronto fee schedule effective 1 April 2026; NFPA, Structure Fires in Eating and Drinking Establishments, R. Campbell, February 2017. Verified July 2026. Where a figure comes from an edition other than the one Ontario adopts, we have said so.