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UL 300 is a fire testing standard administered by Underwriters Laboratories (UL). In order for appliance companies to receive UL labels on their products, each individual model must be submitted to Underwriters Laboratories for testing. The appliances must meet specific requirements in order to be approved and certified as UL 300. 

 In 1994, Underwriters Laboratory (UL) issued a new standard, UL 300, for the fire testing of fire suppression systems protecting commercial cooking operations. 

Why have a UL 300 System?

Commercial cooking fires had gotten more difficult to extinguish over time.

Before 1994, most commercial cooking involved animal fat. The deep fryers that were used were poorly insulated which made cooking temperatures inconsistent and in-efficient. 

The extinguishing unit that protected those kitchens was a dry-chemical system which would smother the fire. Today, vegetable oils are used in commercial cooking and they heat to cooking temperatures quickly. Today’s deep fryers have excellent heat retention and are well insulated. Dry chemical systems are no longer capable of extinguishing and sustaining an extinguished fire.

UL 300 systems use wet chemicals which serve two purposes: 1.) To smoother the fire, similar to the way dry chemicals did; and 2.) To cool the liquids so they don’t re-ignite, something dry chemical systems couldn’t do. Although a system might be labeled as wet chemical, it may not necessarily be rated to the UL-300 standard. 

All kitchen fire suppression systems manufactured after 1994 must comply with the UL 300 standard. To meet that standard, system manufacturers have increased the amount of wet chemical agent applied to cooking appliances to reinforce the cooling effect of Wet Chemical Kitchen Systems - an important tool in extinguishing modern cooking fires.

Requirements for a UL-300 Systemequirements for a UL 300 System

  • Nozzles located in the hood and duct

  • Nozzles located over each cooking Appliance

  • Manual pull station

  • Automatic fuel shut-offs for gas and electric

  • UL 300-compliant wet chemical extinguishing system

  • Wet chemical extinguishing system serviced semi-annually by an authorized licensed service company

  • Hood and duct maintenance and cleaning semi-annually by an authorized licensed service company

  • Baffle filter cleaning recommended weekly


** Fact: There are approximately 8,160 structure fires at eating and drinking establishments each year. More than 50% of these fires were caused by cooking equipment**

Open flames, red-hot cooking surfaces, and a heavily grease-laden environment combine to make the modern commercial kitchen a potentially dangerous fire hazard. Kitchen fires spread quickly and have proven to be very difficult to extinguish, making them the leading cause of structural fire damage in the United States. Fire Suppression systems were developed for the reason of protecting the modern commercial kitchen from the ever-present danger of cooking oil and grease fires.

 S.O.S Fire Services can design, install & maintain restaurant & commercial cooking fire suppression systems that will prevent & extinguish restaurant fires in these types of cooking environments.

Having your fire suppression system properly maintained makes a world of difference when it comes to protecting your restaurant against fire. Cooking appliances usually use potentially hazardous open flame as the primary heating source, so it is vital for you to have the right program and tools in place to protect your restaurant facility and its people in the worst-case scenario. 

We provide 24 hour service and the latest technology to ensure your restaurants are operating within fire code. Whether your demands may be an emergency, system repair, a semi annual inspection, installation or a retrofit, we will provide you with the service you need.

Our team of service technicians are well-trained and established in UL 300 upgrades, SFM,  NFPA 17A, 17 and NFPA 96 requirements.!



Paint spray booths are utilized in facilities from small automotive body shops to very large industrial facilities. Not only do most used lacquer and paint products provide a fuel for a fire, the fires by-products can place a much larger danger to personnel in the area of the fire. This application requires a system designed to sense fires quickly, sound alarms to warn personnel in the area and suppress the fire. 


Generally, a paint booth fire suppression system includes dry chemical tanks that are discharged when heat-sensitive fuses are broken. In the event if a fire, when any one of the fuses break, tensioned cables are released which punctures a C02 canister, thus releasing a chemical fire retardant through nozzles positioned throughout the paint booth (and sometimes parts of the exhaust stack.) Also, a manual trigger will be located at the personnel entrance to the spray booth, allowing a user to trigger the system from outside the booth.

S.O.S Fire Services Inc offers a variety of paint booth fire suppression systems, depending on your location. When you order a paint booth fire suppression system from S.O.S Fire Services Inc, it will include dry chemical tanks and system components, as well as professional installation of the system. 

System will be according to state and local laws. Such systems must be installed by a licensed and approved contractor, and the system must be UL listed. 

Spray Booths Fire System
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