The standard “UL 2775 Standard for fixed condensed aerosol extinguishing system units,” developed by Underwriters Laboratories (UL), describes the requirements for the construction and operation of fixed condensed aerosol extinguishing system units, including aerosol-generating extinguishing system units and aerosol-generating automatic extinguishing units, designed for total flood applications when installed, inspected, tested and maintained in accordance with the “NFPA 2010 Fixed aerosol fire extinguishing systems” standard and the Canadian national fire code standard.
Automatic aerosol-generating extinguishing units do not have a manual activation method and are not designed to:
A relatively new technology, the condensed aerosol fire suppression system is a system of aerosol canisters or single canisters connected together and to a control panel, designed to extinguish fires in special hazard applications. Other special hazard fire protection systems such as dry chemical, wet chemical, gaseous clean agent (halocarbon or inert gas), water mist, carbon dioxide, and, in the past, halon systems, are also used in similar applications.
Special hazard applications are those that are not suitable for automatic sprinkler protection because of the fire hazard itself or the contents being protected. Automatic sprinkler systems can damage sensitive information technology equipment, and even wet chemical systems used to protect commercial cooking operations can damage cooking equipment and present cleaning challenges.
Unlike other special hazard systems, condensed aerosol suppression systems do not require a separate container for the agent itself or a network of interconnected pipes to deliver the agent. Condensed aerosol systems operate by smoke or heat detection, in conjunction with control panels, thermally activated, or manually operated with pull stations.
Concentrated aerosol fire suppression can also be used for small, localized protection, such as providing fire suppression for electrical cabinets or vehicle engines. Finally, concentrated aerosol fire suppression can be used in portable fire extinguishers or as modules to be dropped on fire areas by first responders to extinguish flames before they enter the containment.
The traditional fire triangle shows that heat, a fuel source, and oxygen are necessary for a fire to spread. However, there is a fourth element that is not often discussed for a fire to spread: an unabated chain reaction. This chain reaction is mostly hydrogen ions reacting with other chemicals to produce heat.
Concentrated aerosol fire suppression primarily extinguishes or suppresses a fire by disrupting the chemical chain reaction. Disrupting the chemical chain reaction of a fire is considered the most effective method of extinguishing a fire, and therefore halon systems, which suppress the fire in the same way, are considered one of the most effective fire suppression systems. Halon and other chemicals like it have recently been banned and are only permitted for military use. Additionally, the U.S. Environmental Protection Agency (EPA) has approved concentrated aerosols for use in fire suppression systems.
The order of operation of condensed aerosols is as follows:
In short, aerosol fire suppression systems contain a solid chemical compound extinguishing agent that breaks down and releases when the system is activated. The concentrated aerosol pellet contains a proprietary blend of chemicals that varies by brand.
The “NFPA 2010 Fixed aerosol fire suppression systems” standard is the primary standard used to design, install, and maintain fixed aerosol systems. This standard applies to fixed systems used to protect fixed hazards such as electrical cabinets and electrical switchgear rooms. The UL 2775 standard is the standard that governs the requirements for components used in condensed aerosol systems.
Among the numerous testing, measurement, analysis and evaluation studies that our organization has carried out for businesses in various sectors, it also provides testing services defined in the "UL 2775 Standard for fixed concentrated aerosol extinguishing system units" standard with its trained and expert staff and advanced technological equipment.
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