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INST APD0601 A140513 Wireless Smoke Heat Alarm Install Guide
In typical single level and multilevel dwelling units and apartment
buildings having similar smoke alarm systems there is a possibility that
signals sent by wireless sensors may be blocked or reected by metal
before they reach the alarm Control Panel, even if the signal path has
been recently checked during a weekly test. Blockage can occur if a
metal object has been moved into the sensor’s signal path.