These requirements cover automatic sprinklers intended for installation on sprinkler systems for fire-protection service. Requirements for the installation and use of sprinklers are included in the Standard for the Installation of Sprinkler Systems@ NFPA 13.The requirements in this standard are not intended to restrict the application of representative fire and other tests for special sprinklers@ as referenced in Standard for the Installation of Sprinkler Systems@ NFPA 13@ that are intended to provide protection for specific fire hazards.Sprinklers are categorized by operating temperature rating@ nominal ??K?? factor@ installation position@ type of coating@ or plating@ and other factors that have a bearing on their application.?