DUCT HOUSING - 2 WIRE WITH RELAY FOR ADDRESSABLE SYSTEMS
FDBZ492-HR Siemens Duct Housing - 2 Wire With Relay For Addressable Systems The Siemens Fire Safety Model -series of airduct-detector housings are designed to be used with the Siemens Model 'FD'-series and the Model OP121 detectors. Designed for installation directly to heating, ventilating and air-conditioning (HVAC) duct systems, the Model -series complies with National Fire Protection Association Standard (NFPA) No.'s 72 and 90A, and is Underwriters' Laboratories Listed.
When equipped, the air-duct detector housing will signal the presence of smoke being carried through the duct system. Air-duct detectors are not intended to be substituted for open-area detection.
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