Siemens FDBZ492 2-Wire Duct Housing (No Relay)

The Siemens FDBZ492 2-Wire Duct Housing without relay is an air duct monitoring housings containing sampling tubes. When used with a compatible smoke detector, smoke and combustion products are detected for shutdown of the duct system and/or operation of supplementary equipment as provided by the system control panel. COMPATIBLE for use with these detetor heads: PE-11/-11C, FP-11/-11C, HFP-11, HFPO-11, SFP-11, SFPO-11, 8854, 8713, 8710, OP121, FDO421, FDOOT441, FDOOTC441, OP921, OOH941, OOHC941 SAMPLING TUBES: — ST-10 For duct widths of 6" to 1.0’ — ST-25 For duct widths of 1.0’ to 3.0’ — ST-50 For duct widths of 3.0’ to 5.0’ (requires support) — ST-100 For duct widths of 5.0’ to 10.0’ (requires support) p/n S54319-B22-A1