Data Sheet for Product
ARCHITECT AND ENGINEER SPECIFICATIONS 
Data Sheet 
Models FDBZ492, FDBZ492-HR, FDBZ492-R and FDBZ492-RP {with FDBZ-WT and FDBZ-RTL} 
Specialized Devices 
Air-Duct Housings (FDBZ Series) 
Product Overview
The Siemens  ─  Fire Safety Model ‘FDBZ’-series of  air-
duct-
detector housings are designed for use with 
Siemens Model ‘H’-series,  Cerberus PRO-series and 
Model OP121 detectors (see: Details for Ordering for 
a complete list of compatible devices). 
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. 
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. 
Notes: Most conventional time-control equipment guarantee 
only one (1) detector per zone when the detector’s 
operated relay function is critical. The connection 
of a remote lamp and a remote relay −per detector 
−  is allowed. Refer to the installation manual of 
the respective conventional FACP.
Notes
  -  (cont.’d):
 With either the Cerberus  PRO  series or 
FireFinder
®
 XLS series of FACPs, up to 252-addressable detectors 
with relays per circuit may be used. The connection of an intelligent 
remote lamp (
ILED) and a remote relay is allowed for each detector 
simultaneously.
Specifications 
The Model ‘FDBZ’-series of air-duct housings are uniquely 
designed to use with the photoelectric detector.  
Sensitivity  of Models PE-11, PE-11C  and OP121 detectors 
can be verified for calibration via LED visual status or a 
Model RSAW-11, Model RSAC-11 or FDBZ-RTL multi-color 
remote lamp. A
  green  flash indicates the detector has 
passed its self test. Amber  indicates a Trouble  condition, 
and red indicates an Alarm event. 
Sensitivity for Models HFP-11, FP-11,  SFP-11,  HFPO-11, 
SFPO-11,  OP921, OOH941 and OOHC941is  verified from 
the multi-
color LED of the respective detector, or its 
sensitivity reading may be printed by command from the 
corresponding FACP to an optional printer.
9906C
Model `FDBZ’ Series of Air-Duct Housings and Detectors 
Cerberus®
PRO 
Fire Safety Products 
• 
Four (4) models available 
  Addressable and conventional with and without relays 
•  Compatible with various Siemens ─ Fire Safety 
fire-alarm control panels (FACPs)
•  Magnet test feature with the Model OP121 
conventional detector 
•  Design for air-velocity range of 100 
to 4,000 feet-per-minute (fpm) 
•  Robust, compatible conventional remote indicator test 
switch that incorporates tri-color light-emitting diode (LED)
•  Clear housing cover with smoke test port on cover 
for quick identification of detector type 
  Removable with only four (4) captive-thumb screws (no tools required) 
 
Includes a smoke / aerosol detector test port 
•  Optional NEMA 4X-reinforced, stainless-steel and 
watertight enclosure available, Model FDBZ-WT 
•  No tools required for cover removal, sampling and 
exhaust-tube installations 
•  Trouble-event activation upon front-cover removal 
•  Alarm LED visible from front 
Remote alarm 
indicator 
[FDBZ-RTL] 
 FDBZ-series of air-duct housings 
[FDBZ492, FDBZ492-HR, FDBZ492-R and FDBZ492-RP] 
Watertight housing 
[FDBZ-WT] 
•  Self-contained model available with ‘on-board’ 
power supply for conventional detectors 
•  Expanded temperature range 
•  Relay models available 
• 
UL268A Listed,  ULC-S529 Listed; 
FM (#3010), CSFM (#3240-0067:0265) Approved 




