DH-99 Series | Hochiki's UL Approved Fire Detection

Addressable Duct Smoke Detector | UL Addressable Fire Detection

DH-99 Series Description 


DH-99 Addressable Duct Smoke Detector provides early detections of smoke and products of combustions present in the air, moving through the HVAC ducts in Commercial, Industrial, and Residential applications. The DH-99 is designed to prevent the recirculation of smoke in areas by the Air Handling Systems, fans, and blowers. Complete systems may be shut down in the event of smoke detection. The DH-99-A and the DH-99-AR operate on the Digital Communication Protocol (DCP), a 24VDC source is required for the DH-99-AR.


DH-99 is designed and built to meet all local requirements, as well as the NFPA regulations regarding duct smoke detectors. The DH-99-AR is provided with output terminals for remote accessories such as remote status indicators and reset key switches or push buttons. Air Sampling is accomplished by two tubes of one standard length (7.5”) is supplied in the installation kit with the smoke duct unit. Once the duct width has been determined, the air intake sampling tubes must be ordered. Sampling tubes are supplied in three standard lengths 2.5ft., 5ft., and 10ft. And shall be cut to size to fit the duct. Mounting the duct smoke unit is accomplished by the use of a template and 4 sheet metal screws, which are provided. Mounting can be achieved without the removal of the clear cover which is secured by 4 capture screws.

DH-99 Series Features & Specifications 


- Detects and limits the spread of smoke throughout building HVAC ducts

- Compatible with building automation and Fire Alarm Systems

- Installs quickly and easily

- No screen of filters to clean

- Meets UL268A requirements

- Remote LED compatible with the DH-99-AR Model


Duct Detector Mode:l DH-99-A | DH-99-AR
Sensor Head: ALK-D | ALK-D
Sensor Type: Addressable Photoelectric | Addressable Photoelectric
Transmission Method: DCP - Digital Communication Protocol | DCP - Digital Communication Protocol
Input Voltage: DCP Powered Loop | DCP Powered loop / 24VDC

Sampling Tubes: 2.5ft., 5ft., or 10ft. | 2.5ft., 5ft., or 10ft

Net Weight: 3lbs. | 3lbs

Finish: Grey Paint | Gray Paint


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