Siemens FDBZ492-HR Duct Detector Housing /w RelayThe Siemens FDBZ492 HR Duct Detector Housing is a two wire addressable duct detector (with relays) designed for direct use to HVAC airduct systems. Works with the Remote Test Switch (FDBZ492 RTL). Detector and sampling tube to be purchased separately. Minimum hardware required is: one (1) air duct housing assembly; one (1) sampling tube and one (1) detector. This product is for use with the following compatible detectors: FDO421 FDOOT441 FDOOTC441 FP
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