Kitchen Fire Safety: Protecting Your Business

Why Commercial Kitchens Are High-Risk

Commercial kitchens combine everything a fire needs: intense heat, open flames, hot oil, and an abundant fuel source in the form of grease. Every time you cook, grease-laden vapour rises from your cooking equipment, passes through the extraction canopy, and travels through the ductwork to the roof fan. Along the way, grease deposits build up on every internal surface.

Over time, these deposits create a continuous trail of highly flammable fuel running from directly above your cooking equipment, through your building's structure, right up to the roof. A single flare-up, a pan fire that reaches the canopy, or even an electrical fault in the system can ignite these deposits. Once a grease fire enters the ductwork, it can spread through the building in minutes.

According to UK fire service data, cooking-related incidents are consistently among the leading causes of commercial property fires. A significant proportion of these originate in poorly maintained extraction systems where grease buildup has been allowed to reach dangerous levels.

How Grease Fires Start and Spread

Understanding how extraction system fires develop helps explain why regular cleaning is so critical:

Ignition

Most extraction fires begin when flames from the cooking surface reach the canopy. This can happen during a pan fire, a flare-up on a grill or wok burner, or when oil in a deep fryer overheats and ignites. If the canopy interior is coated in grease, that grease catches fire almost immediately.

Spread Through Ductwork

Once fire enters the ductwork, it follows the grease deposits like a fuse. The enclosed duct acts as a chimney, drawing the fire upward with increasing intensity. Grease fires in ductwork burn extremely hot, enough to compromise the structural integrity of the duct itself and radiate heat into surrounding building materials.

Building Involvement

If fire dampers fail to close, often because they're jammed with grease, the fire can pass through fire compartment walls and spread into ceiling voids, roof spaces, and neighbouring areas of the building. At this point, a kitchen fire has become a building fire.

The Speed Factor

The entire sequence from ignition to serious building involvement can happen in minutes, not hours. By the time the fire service arrives, an extraction fire that started with a small flare-up can have spread well beyond the kitchen. This is why prevention through regular cleaning is so much more effective than relying on reactive measures alone.

How Regular Cleaning Reduces Fire Risk

Professional extraction system cleaning to TR19 standards directly addresses the root cause of extraction fires: grease buildup. A properly cleaned system means:

• Minimal fuel so that even if flames reach the canopy, there's little or no grease to sustain or spread the fire
• Working fire dampers because cleaning includes testing fire dampers to ensure they close properly, containing any fire within the duct
• Clear airflow allowing a clean system to extract heat and vapour efficiently, reducing the temperature around cooking equipment
• Early detection as engineers inspect the entire system during cleaning and identify damage, wear, or faults that could contribute to fire risk

The difference between a well-maintained system and a neglected one is stark. In a clean system, a pan fire that reaches the canopy is an inconvenience. In a grease-laden system, the same incident can destroy your business.

Insurance: The Hidden Risk of Neglect

Fire risk is the most obvious danger of a poorly maintained extraction system, but the insurance implications can be equally devastating, even if a fire never happens.

Policy Conditions

Most commercial kitchen insurance policies include specific conditions around fire prevention and maintenance. These typically require you to maintain your extraction system in good working order, have the system professionally cleaned at appropriate intervals, keep documentation proving compliance, and follow recognised standards such as TR19.

These aren't suggestions. They're conditions of your cover. Failing to meet them can affect your policy regardless of whether you make a claim.

What Happens After a Fire

If a fire occurs and you need to make a claim, your insurer will investigate. They'll want to see your TR19 certificates, cleaning records, and maintenance documentation. If you can't produce evidence of regular professional cleaning:

• Claim refusal where your insurer may refuse to pay out entirely, leaving you to cover all costs of damage, rebuilding, lost stock, and business interruption from your own funds
• Partial payment where some insurers may pay a reduced amount, arguing that your negligence contributed to the severity of the fire
• Policy cancellation where your insurer may cancel your policy, making it extremely difficult and expensive to get cover elsewhere

Even Without a Fire

Insurance companies don't just check your maintenance records after a claim. Some conduct periodic audits or require documentation at renewal. If they discover your extraction system hasn't been properly maintained:

• Premium increases with your renewal premium increasing significantly to reflect the higher risk
• Additional exclusions where fire-related cover may be excluded or restricted until you can prove compliance
• Cover withdrawal where in extreme cases your insurer may decline to renew your policy altogether

The cost of regular extraction cleaning is a tiny fraction of any of these outcomes. For guidance on how often your system should be cleaned, see our guide on extraction system cleaning frequencies.

Fire Suppression Systems: Important but Not Enough

Many commercial kitchens have fire suppression systems installed, typically wet chemical systems mounted above cooking equipment that activate automatically when they detect extreme heat. These are valuable safety features, but they have limitations:

• Reactive, not preventive. Suppression systems respond to fires that have already started. They don't prevent ignition in the first place.
• Limited coverage. Most systems protect the cooking area and canopy. They may not reach deep into the ductwork where a grease fire can take hold and spread.
• Maintenance dependent. Suppression systems need regular inspection and servicing to function correctly. A system that hasn't been maintained may not activate when needed.
• Not a substitute for cleaning. Having a suppression system does not remove the requirement for regular extraction cleaning. Your insurer and fire safety officer expect both.

Think of suppression systems as your last line of defence. Regular cleaning is your first, and most effective, line of defence.

What to Do If a Kitchen Fire Breaks Out

Even with the best maintenance, fires can still occur. Every kitchen should have a clear fire response plan:

Immediate Response

• Activate the fire suppression system if it hasn't triggered automatically
• Turn off gas and electricity to cooking equipment if safe to do so
• Never use water on an oil or grease fire as it will cause a violent fireball
• Use the correct extinguisher. Wet chemical (Class F) extinguishers are designed for cooking oil fires
• Evacuate if in any doubt. Get everyone out and call 999

After the Fire

• Don't re-enter until the fire service confirms it's safe
• Contact your insurer as soon as possible
• Gather your documentation including TR19 certificates, cleaning records, fire risk assessment, and suppression system service records
• Don't clean up until your insurer has assessed the damage and given permission

Building a Complete Fire Safety Strategy

Extraction cleaning is one part of a comprehensive approach to kitchen fire safety. A complete strategy includes:

Regular Professional Cleaning

Have your extraction system cleaned to TR19 standards at the frequency appropriate for your kitchen type. Keep all certificates and reports on file.

Day-to-Day Maintenance

Clean baffle filters weekly, wipe down canopy surfaces after each service, and check grease drain channels regularly. Good daily habits extend the effectiveness of professional cleans.

Fire Risk Assessment

Under the Regulatory Reform (Fire Safety) Order 2005, you must have a fire risk assessment for your premises. This should cover your kitchen extraction system specifically and be reviewed regularly.

Staff Training

Every member of kitchen staff should know how to respond to a fire, which extinguisher to use, where the gas and electrical shut-offs are, and how to evacuate safely. Run regular fire drills and keep training records.

Equipment Checks

Fire suppression systems, extinguishers, fire blankets, fire dampers, and alarm systems all need regular inspection and servicing. Set up a maintenance calendar and stick to it.

Documentation

Keep everything. TR19 certificates, suppression system service records, fire risk assessments, staff training records, and equipment inspection logs. If something goes wrong, this documentation is your evidence that you took fire safety seriously.

Frequently Asked Questions

How do I prove to my insurer that my extraction system is properly maintained?

Keep your TR19 compliance certificates from every professional clean, along with the accompanying photographic reports. Most insurers accept these as evidence of proper maintenance. If your insurer has specific requirements, ask them exactly what documentation they need and make sure your cleaning provider can supply it. CKC Approved cleaners provide full TR19 documentation with every clean.

Can a fire safety officer shut down my kitchen?

Yes. Under the Regulatory Reform (Fire Safety) Order 2005, fire safety officers have the power to issue prohibition notices that prevent you from using part or all of your premises until identified hazards are resolved. A heavily grease-laden extraction system with no evidence of regular cleaning could be grounds for a prohibition notice.

My landlord is responsible for the building. Am I still responsible for extraction cleaning?

Generally, yes. The "responsible person" under fire safety legislation is usually the person who has control of the premises, which in most cases is the tenant operating the kitchen. Check your lease, but don't assume your landlord is handling extraction cleaning unless it's explicitly stated and you have evidence it's being done.

What class of fire extinguisher do I need in a commercial kitchen?

Commercial kitchens should have Class F wet chemical extinguishers, which are specifically designed for cooking oil and fat fires. You may also need CO2 extinguishers for electrical equipment. A fire safety professional can advise on the correct type and number for your kitchen. Never rely on water extinguishers in a kitchen, as water on a grease fire causes an extremely dangerous reaction.