Siemens OP921 Photoelectric Smoke DetectorThe Siemens OP921 Photoelectric Smoke Detector is a plug in, two wire, addressable, photoelectric smoke detector compatible for use with Siemens Model H series devices on the same loop with Cerberus PRO fire alarm control panels or FireFinder XLS FACPs. Programmable. Compatible with Model 8720 DPU (device programmer loop tester) Suitable for use in air duct housings models FDBZ492 and FDBZ492 HR.
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