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Mention the words "fire sprinkler system" and most builders are skeptical, voicing concerns about cost, reliability, and the aesthetic impact on the home. But as this article will show, residential sprinkler systems are economical, aesthetically pleasing, and rarely fail. Most important, they can save lives. NFPA Standards Residential fire sprinkler systems are regulated by two similar National Fire Protection Agency standards that were developed for systems designed for the home. NFPA 13D ("D" for dwelling) regulates one- and two-family dwelling sprinkler systems, while NFPA 13R ("R" for residential) is for residential buildings up to four stories in height. Whereas commercial sprinkler systems focus on property protection, residential sprinkler systems are designed