Actuating mechanism: automatic or manual activation leading to the physical discharge of the extinguishant.

          Aerosol: a pyrotechnically generated extinguishant consisting of finely divided solid particles and gaseous matter,
          these being combustion products of solid aerosol-forming composition.

          Aerosol generator: same as Pyrogen generator

          Aggressive environment: where environmental variables such as temperature and/or vibration undergo cycling at or
          close to the extreme limits of the Pyrogen generator. Corrosive atmosphere may also be a factor.

          Appropriate authority: a Minister of the Crown, a government department, or other public authority having power to
          issue regulations, order or other instructions having the force of law in respect of any subject covered by a British
          Standard or, in the case where none of these apply, the owner or the owner's agent.

          Approved and approval: approved by, or the approval of, the appropriate authority.

          Automatic: performing a function without the necessity of human intervention.

          Automatic/Manual Switch: a device that can be operated before a person enters a space protected by Pyrogen fire
          suppression system to prevent automatic release of fire extinguishing aerosol. Normal detection sequence is
          unaffected.

          Class A fires: fire involving solid materials, usually of organic nature. Can be further categorized into surface burning
          fires and deep-seated fires. Deep-seated fires smolder and may combust slowly beneath the surface of the hazard.

          Class B fires: fires involving liquids or liquefiable solids.

          Class C fires: fires involving gases.

          Class E fires: electrically energized fuels (UL Class C)

          Class F fires: fats and cooking oils (UL Class K)

          Combustion reaction: a reaction resulting from the ignition of a solid aerosol-forming composition, which produces
          fire extinguishing aerosol.

          Control device: a device to control the sequence of events leading to the release of the extinguishant.

          Coolant: a heat absorbing medium.

          Design concentration (g/m3): the mass of Pyrogen aerosol per m3 of enclosure volume required to extinguish a
          specific type of fire, including a safety factor.

          Design Factor (g/m3): the mass of Pyrogen solid aerosol-forming composition per m3 of enclosure volume required to
          achieve the design concentration

          Design quantity: the mass of Pyrogen solid aerosol-forming composition necessary to extinguish a fire in a particular
          risk, including a safety factor.

          Extinguishant: aerosol produced from Pyrogen generator.

          Generator: please refer Pyrogen generator.

          Holding time: the period during which the extinguishant is required to maintain a minimum effective concentration.

          Hot Work: grinding, welding, thermal or oxygen cutting or heating and other related heat-producing or
          spark-producing operations.

          Inerting: the prevention of ignition of a flammable or explosive atmosphere by establishing a suitable concentration of
          extinguishant.

          Igniter: any device, which is able to ignite the solid aerosol-forming composition.

          Location drawing: a plan of the risk clearly indicating the as-installed location of all Pyrogen generators, controls and
          maintenance isolate switch.

          Manual: requiring human intervention to accomplish a function.

          Monitoring: the supervision of the operating integrity of an electrical control feature of a system.

          Normally occupied area: an area where, under normal circumstances, humans are present.

          Normally unoccupied area: an area that is not occupied by humans under normal circumstances but may be entered
          occasionally for brief periods.

          Operating device: any component involved between actuation and release.

          Primary release: release of extinguishant initiated by detection system or manual operation under normal conditions.

          Pyrogen generator: a device capable of generating the Pyrogen aerosol extinguishant when activated either
          electrically or thermally. Consists of an electrical and/or thermal ignition device, solid aerosol-forming composition
          and coolant enclosed within a corrosion resistant casing incorporating an end-plate nozzle.

          Release: the action leading to the physical discharge or emission of the extinguishant into the enclosure.

          Shall: indicates that a statement is mandatory.

          Should: indicates a recommendation.

          Smoldering: slow combustion of material without visible light and generally evidenced by smoke and an increase in
          temperature.

          Solid aerosol-forming composition: a mixture of combustible component, potassium salt based oxidant and
          technical admixtures producing fire extinguishing aerosol upon ignition. May also be referred to as a solid
          aerosol-generating chemical or aerosol element.

          System isolate switch: see Automatic/Manual switch.

          Thermal ignition device: a linear fuse, which automatically ignites at a rated temperature or when exposed to a
          naked flame and arranged to ignite the solid aerosol forming composition.

          Total flooding system: a fixed fire suppression system, which distributes the extinguishing medium throughout the
          protected enclosure.