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Siemens FDBZ492-PR
Four-Wire Conventional Duct Detector with Relays and a Built-in Power Supply
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Siemens FDBZ492-R
A two-wire conventional duct detector with relays designed for direct use on HVAC air-duct systems.
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Four-Wire Conventional Duct Detector with Relays and a Built-in Power Supply
A two-wire conventional duct detector with relays designed for direct use on HVAC air-duct systems.