http://ulstandardsinfonet.ul.com/tocs/tocs.asp?doc=s&fn=0300.toc UL 300 Why UL 300? In November, 1994, Underwriters Laboratories (UL) published UL 300 -- the stringent new testing requirements for manufacturers of kitchen hood and duct fire protection systems. These requirements were driven by the fact that many restaurant owners had installed new, high efficiency burners that heated cooking oils to higher temperatures than in the past, and installed new fryers with better insulation that reduced the cooling rate of oils thus keeping them above their auto-ignition point for a longer time. The obvious result was more kitchen fires. The new standard for testing mandates tougher, more realistic tests for fryers, ranges, griddles, certain types of broilers and new woks. Kitchen System Manufacturers Comply: The manufacturers of kitchen fire suppression systems were required to redesign and re-test all of their systems in order to comply with UL 300s standards. None of the existing dry chemical systems could pass the new testing requirements. Most wet chemical systems failed as well. Only wet chemical systems with increased flow rates, additional flow points and increased agent capacity have been able to meet UL 300 standards. What Does This Mean to You? As an owner of a restaurant, you should seriously consider upgrading to the new UL 300 standard since your current system(s) most likely do not adequately protect your cooking area(s). In addition, area fire marshals have agreed that any new system installed after April 1, 1995, must meet the new UL 300 standard which will likely require an additional cost for you. Also, any current system(s) to which new appliances have been added will require a complete system upgrade to meet the new UL 300 standards. Associated Fire Protection's UL 300 Compliance Policy: Based on the requirements of our insurance carriers and kitchen fire systems manufacturers, Associated Fire Protection's policy will be to cease all inspections, modifications and repairs of non-UL 300 compliant fire suppression systems as of July 1, 2005. New wet chemical systems installed after November 20, 1994, are the only systems that are acceptable. If your system was installed prior to November 20, 1994, we strongly recommend replacement with a new UL 300 compliant wet chemical kitchen fire suppression system. If your kitchen is currently protected by a non-UL 300 compliant fire suppression system, AFP would appreciate the opportunity to work with you to install an effective, new system that will be complaint with all local fire codes. UL-300 Standard Update -------------------------------------------------------------------------------- UL-300 On November 21, 1994, a new Underwriters Laboratories test standard entitled UL 300, Fire Testing of Fire Extinguishing Systems for Protection of Restaurant Cooking Areas went into effect. This new standard is the result of changes in fire hazards involving commercial cooking equipment. Pre-engineered chemical suppression systems were developed in the 1960's for the protection of commercial cooking equipment, plenums and ducts. Underwriter's Laboratories (UL) developed a series of fire tests for these systems designed to duplicate the potential fire hazard found in the work place. These tests established specific requirements (and limitations) affecting extinguishing agent, fire detection, piping limitations, nozzle coverage, etc., for each manufacturer who submitted its system for UL testing. Following successful completion of such tests, this data created the installation and maintenance manual for that specific manufacturer. Fats and Temperature At the time that these tests were developed, rendered animal fat (lard) was typically used in commercial kitchens to fry various foods. Commercial cooking operations, appliances and supplies have changed greatly since the 1960's. Health concerns have reduced the use of lard. Efforts to cook faster have caused the use of insulated "high efficiency " fryers that heat faster and cool slower. Restaurant suppliers estimate that 70-75% of commercial kitchens use vegetable oils for frying in high-efficiency fryers. These changes have significantly altered the fire hazard in cooking areas. Lard has a large percentage of saturated fat whereas vegetable oils have a very low percent of such fatty acids. The auto-ignition temperature of most animal fats in the 550-600 degree F. range compared to the auto-ignition temperature of most vegetable oils which is at 685 degree F. and higher. The extinguishing agent employed in pre-engineered restaurant systems is an alkaline base. Fatty acids combine with alkalines to produce a soapy solution in process known as saponification. Thus, when a suppression system is discharged on a burning deep fat fryer containing rendered animal fat, a soap blanket is formed cutting off the oxygen supply and containing the fire until the fuel (animal fat) is cooled below its auto-ignition temperature. A similar fire involving vegetable oils creates a different set of circumstances. With only a limited amount of fatty acids saponification is greatly reduced and the higher temperature of such fires, enhanced by the insulation in a high efficiency fryer, causes the soap blanket to break down. Thus the extinguishing capability of the fire suppression system is reduced. Time for Change UL recognized the need for a new set of standards for pre-engineered systems and developed its new UL 300 standard. As might be anticipated, many changes were made in the testing program. A chart comparing former tests with the new requirements is printed on the reverse of this page. Unfortunately, UL did not require a model number change for those manufacturers who will be modifying existing system designs to comply with the new UL 300 test standard. The only requirement is the issuance of a new installation and maintenance manual containing whatever changes and modifications found necessary for the compliance with the new standard plus the effective date of the revised publication. This could lead to some confusion because of similarities between the old and new system components. Buyer Beware We must assume that there will be a small number of sellers/installers who will attempt to furnish either new or used systems that were tested to the former standard. Such fire suppression systems would be inadequate to deliver the additional coverage found to be necessary for today's fire hazards. UL-300 and the Fire Service How can a local authority determine if the system complies with the new UL 300 standard? It is suggested that the contractor be required to include with his submittal package a copy of the manufacturer's installation and maintenance manual that would specifically indicate it is in compliance with the new standard and dated November 1994 or later. The new UL 300 standard assures fire protection for a hazard that has gone through many changes. It presents the most significant advancements in testing of pre-engineered restaurant fire suppression systems in the past 20 years. Without careful scrutiny by local authorities such changes would have little effect if fire suppression systems are allowed to be installed under the old listings and manuals. Final Remarks The new UL Standard 300 addresses the problems in fire protection for commercial cooking environments which reflect changes in our diet and the way we prepare food. All of these changes have resulted in fires which are hot, stubborn and difficult to extinguish. Nozzle coverages and placement options are likely to decrease while extinguishing agent amounts increase. Pre-engineered systems for commercial cooking operations will become more detailed, more technical, and more expensive. They will also be safer, more reliable and perform their primary function better than ever before.