Does anyone know how to decode this date code (Siemens FP-11) smoke/heat : r/firealarms
Siemens (OP921) Photoelectric Smoke Detector S54320-F4-A2
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Siemens Fire Detectors | Smoke Detectors | Gas Detector | Fire Detection | Flame Detectors
Siemens HFPT-11 Heat Detector - Rybb Fire Alarm
