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electrical - Integrating hard-wired smoke detectors with fire sprinkler waterflow sensing - Home Improvement Stack Exchange
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Kidde Firex Hardwired Smoke Detector with Ionization and Photoelectric Dual Sensors 21007915-N - The Home Depot
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First Alert SA511CN2-3ST Interconnected Wireless Smoke Alarm with Voice Location, 2-Pack - Walmart.com
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