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R313.4.5 Interconnection of Carbon Monoxide Alarms and Detectors
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When more than one carbon monoxide alarm or carbon monoxide detector is required to be installed within an individual dwelling unit or sleeping area, all carbon monoxide alarms and all carbon monoxide detectors in such dwelling unit, sleeping unit or sleeping area shall be interconnected.
Exception:
Interconnection is not required where battery operated, cord-type or direct plug carbon monoxide alarms and carbon monoxide detectors are permitted.