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X-Sense Wireless Interlinked Smoke Alarm Detector with Sealed 10-Year Battery, Interconnected Fire Alarm Conforms to EN 14604 Standard, Link+, SD19-W, 6-Pack : Amazon.co.uk: DIY & Tools
EN 14604:2005 - Smoke alarm devices
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CEN/TS 54-32:2015 - Fire detection and fire alarm systems - Part 32: Planning, design, installation,