The Siemens ? Fire Safety Model ‘FDBZ’-series of air-duct-detector housings are designed for use with Siemens Model ‘H’-series, ‘FD’-series and Model OP121 detectors. Designed for installation directly to heating, ventilating and air-conditioning (HVAC) duct systems, the Model ‘FDBZ’-series of duct housings complies with National Fire Protection Association Standard (NFPA) No.’s 72 and 90A, and is Underwriters’ Laboratories Listed.
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