The Simplex 4098-9685 is a TrueAlarm® duct detector housing designed for surface-mount installation on HVAC supply or return air ductwork. The 4098-9685 accepts TrueAlarm addressable sensor heads and uses sampling probes to draw duct air across the detector element, providing early-warning smoke detection in HVAC air handling systems per NFPA 72 and NFPA 90A requirements.
The 4098-9685 is the standard-generation surface-mount duct housing in the TrueAlarm family, connecting to IDNet or MAPNET II addressable loops on Simplex fire alarm control panels. The updated successor to this housing is the 4098-9688.
- Mount style: Surface-mount on HVAC duct
- Sensor head: Accepts TrueAlarm addressable detector heads
- Sampling: Duct air sampling probes
- Loop interface: IDNet / MAPNET II addressable
- Generation: Standard/earlier generation duct housing
- Application: Duct smoke detection per NFPA 72 / NFPA 90A
The 4098-9685 is a proven surface-mount duct detector housing for Simplex TrueAlarm® addressable systems, providing dependable HVAC duct smoke protection in commercial and institutional buildings.
For more information, contact the Life Safety Consultants team at (888) 557-0558, or email us at: sales@lifesafetycom.com
Additional information
| Weight | 5 lbs |
|---|---|
| Dimensions | 13 × 11 × 7 in |
| Condition | New |
| Manufacturers | Simplex |
| Compatible Panels | 4100ES,4020,4010,4008 |
| Compatible Bases | Standard TrueAlarm addressable sensor heads |
| Cross Reference | 4098-9685 |
| Mount | Surface-mount duct, Sampling: Duct air sampling probes, Head: TrueAlarm addressable, Loop: IDNet/MAPNET II, Generation: Standard earlier, Application: Duct smoke detection NFPA 72 NFPA 90A |








