Siemens AD2-P


Air Duct Housing for use with FP-11, HFP-11, HFPO-11, PE-11

Note: Does not include smoke detector.

Availability: Please Call for Availability

  • Factory New
  • Material Obsolete
Brand: Siemens Part #: N04B-9520 Categories: , Manufacturer Part #: AD2-PSecondary Part #: 500-649706 Tags: ,


The Siemens Building Technologies, Fire Safety Division air duct detector housings are designed to be used with the 11-Series detectors. Designed for installation directly to heating, ventilating and air conditioning duct systems, they comply with National Fire Protection Association Standard No. 90A. When equipped with photoelectric detectors, these units will signal the presence of hazardous quantities of products of combustion or smoke being carried through the duct system. Air duct detectors are not intended to be substituted for open area detection.

Air duct housings can be equipped with optional relays. These relays are utilized to operate any supplementary equipment when smoke or particles of combustion are detected.


Weight 2.00 lbs
Dimensions 14.50 × 5.50 × 4.50 in

Siemens Industry, Inc.





Unit of Measurement

EA (Each)


Duct Detector Housing

Production Status


Product Notes

Does not include smoke detector. Replacement: FDBZ492


  • For Series 11 Detectors
  • Relay Models Available
  • Design for Air Velocity Range of 100 to 4000 fpm
  • Alarm LED Visible From Front
  • Clear Housing Cover for Quick Identification of Detector Type Removable With Only Four Captive Screws
  • UL Listed

Air Duct Housings; AD2 Series


Siemens - Data Sheet

Air Duct Monitoring Housings; Models AD2-P, AD2-PR and AD2-XHR


Siemens - Installation Instructions