Guide
Grease fire in restaurant: How to reduce the risk in your commercial kitchen with effective fire protection
Grease fire is one of the most serious risks in a professional kitchen. It ignites quickly, escalates rapidly, and is difficult to extinguish with conventional means.
Introduktion
According to the NFPA (National Fire Protection Association), cooking equipment is the cause of over 60% of fires in restaurants and food service establishments – and grease accumulation in ventilation systems is one of the most significant contributing factors (source: NFPA, “Structure Fires in Eating and Drinking Establishments”). This makes prevention a management responsibility, not just a cleaning issue.
This article reviews the causes of grease fires, the legal requirements for fire safety in commercial kitchens, and how H2O Shift's Power2Air can be part of the overall fire protection effort.
Why do grease fires occur – and what makes them dangerous?
A grease fire occurs when heated grease ignites – either by direct contact with flame or because the grease reaches its autoignition temperature. In a commercial kitchen, there are many ignition sources: open flames from gas burners, hot surfaces, and electrical faults.
What makes grease fires particularly dangerous in commercial kitchens is the combination of three factors:
Grease buildup in the ventilation system. Grease that is not continuously removed accumulates in the range hood and ducts. A fire that starts at the cooking area can spread to the ventilation system because there is a continuous layer of fuel throughout the duct network.
High temperatures. Deep fryers, wok stations, and grill surfaces operate at temperatures that are close to or above the flash point of most types of fat. Even a brief lapse in attention is enough to start a fire.
Limitations of extinguishing agents. Water must never be used on a grease fire – it atomizes the burning grease and causes the fire to explode. It requires specific equipment to extinguish safely.
Legal requirements and standards for fire safety in commercial kitchens.
There are a number of standards and requirements relevant to commercial kitchens in Denmark:
DS 428 contains relevant requirements for fire protection of ventilation systems. The standard defines requirements for fire compartmentation, material selection, and constructive measures to prevent fire spread via the ventilation system.
DS/EN 16282 is the European standard for ventilation in commercial kitchens. It defines requirements for air volumes, duct design, and extraction capacity – and forms the technical basis for the sizing and operation of ventilation systems in professional kitchens.
EN 13501 classifies the reaction of building materials to fire. The standard is used to assess how materials in extractor hoods, ducts, and installations contribute to or prevent fire spread.
These standards complement each other and together form the framework for what a legally compliant and fire-safe commercial kitchen must comply with. It is the responsibility of the facility management department and kitchen management to know the requirements and ensure that the systems are maintained in accordance with them.
Maintenance as fire prevention
The most effective fire protection starts with a clean system. Grease accumulation in exhaust hoods and ducts is not just a hygiene problem – it's a direct fire hazard that grows every day the system is not cleaned.
A structured maintenance effort should at a minimum include:
Daily cleaning of cooking zones and surfaces near heat sources. Grease that is not removed quickly burns on and becomes much harder to remove.
Weekly cleaning of filters and grease trays in the hood. Overloaded filters reduce the extraction effect and increase grease accumulation in the ducts.
Periodic cleaning of the duct system – in heavily used kitchens, it is recommended at least every six months, and in many cases more often. Regular cleaning is not just good practice – it is a prerequisite for maintaining statutory fire safety requirements.
Ongoing inspection of kitchen equipment for faults and leaks that can constitute ignition sources.
H2O Shift's Power2Air – prevention at the source
H2O Shift's Power2Air works in two steps. When the unit is mounted on the fryer, it reduces grease vaporization by up to 30-40 percent before the grease even reaches the exhaust hood. The unit in the exhaust hood then neutralizes the charge on any grease particles that are present – the grease loses its stickiness and flows down into the grease trays instead of being transported further into the duct network.
The effect is documented: in tests conducted at, among others, Artelia and Clarion Hotel Copenhagen (publicly documented test), grease accumulation in the channels has been significantly reduced, and cleaning intervals have been extended accordingly.
Power2Air is chemical-free. It requires no filters, no UV lamps, and no ongoing consumables. The system is installed in existing exhaust hoods without requiring changes to duct geometry and is compatible with the ventilation requirements set by DS/EN 16282.
Reduced grease accumulation is not the same as no grease accumulation – regular cleaning is still necessary. But by extending the intervals and reducing the amount of grease that reaches the ducts, Power2Air reduces the accumulated fire risk and provides the system with better conditions between cleanings.
Fire extinguishing equipment: what is required in commercial kitchens?
Fire extinguishing equipment is not optional. In commercial kitchens with deep-frying and intensive fat use, it is a requirement to have extinguishing equipment suitable for grease fires.
Powder and CO2 extinguishers are not sufficient for grease fires. The correct equipment is a Class F fire extinguisher (according to EN 3-7), which is specifically designed for high-temperature grease fires. Class F extinguishers work by forming a foam layer over the grease, suffocating the fire and preventing re-ignition.
In addition to handheld extinguishing equipment, kitchens with deep fryers and wok stations should consider automatic systems, which activate directly at the hood and extinguish the fire before it can spread to the ventilation system.
Always check with your insurance advisor and local fire authority to determine the specific requirements that apply to your kitchen type and size.
Summary: What can you do now?
Fire safety in commercial kitchens is about a combination of prevention, maintenance and correct equipment. No single factor is sufficient on its own.
The most efficient commercial kitchens operate on all three levels:
- They clean regularly and systematically – not just when it's convenient
- They use preventive technology like Power2Air to reduce grease build-up between cleanings
- They have correct fire extinguishing equipment installed and available at the cooking zones
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