The color of the little piece of glass (glass bubble filled with liquid alcohol) found inside the sprinkler heads of fire sprinkler systems indicates the temperature at which it bursts (and activates the sprinkler): orange is the lowest temperature and black is the highest. (howtogeek.com)
Orland Park — Chicago Mayor Richard M. Daley and the City Council now have before them a crucial high - rise fire safety ordinance pertaining to the installation of fire sprinklers in high - rise buildings built before 1975. (articles.chicagotribune.com)
Although it responded to NUT and FBU protests by claiming that it was still consulting, its proposed replacement Building Bulletin set out the government's intention: «The Building Regulations do not require the installation of fire sprinkler suppression systems in school buildings for life safety and therefore [guidelines] no longer include an expectation that most new school buildings will be fitted with them.» (educationbusinessuk.net)