NFPA has listed facts about home fire sprinklers at http://www.nfpa.org/public-education/by-topic/fire-and-life-safety-equipment/home-fire-sprinklers.
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North Stafford, VA – Apartment complex fire held in check by sprinkler system; No injuries
The sprinkler system and a quick attack by firefighters is credited for saving $1.9 million in property and contents.