The Kidde KI-DDOS is a photoelectric duct smoke detector built for commercial HVAC systems. It connects to Kidde Intelligent fire alarm control panels over the SLC loop, drawing power directly from the loop with no additional power supply required. Environmental compensation with differential sensing cuts nuisance alarms from dust and humidity without sacrificing detection speed.
Built for the commercial fire installer
UL, ULC, CSFM, and FM listed. The KI-DDOS handles air velocities from 100 to 4,000 ft/min and operating temperatures from -20F to 158F, covering rooftop units and interior air handlers alike. Standard sampling tube spacing matches existing duct cutouts for drop-in migration from legacy detectors - no new duct penetrations needed.
Key features
- Photoelectric detection with environmental compensation: differential sensing reduces nuisance alarms from dust buildup and humidity changes
- SLC loop-powered: draws 50 A standby / 60 A alarm directly from the signaling line circuit - no external power supply needed
- Standard sampling tube spacing: drop-in replacement for legacy duct detectors without new duct penetrations
- Form C auxiliary alarm relay: rated 3.0A @ 30 VDC / 120 VAC for HVAC shutdown or fan control
- Remote test and reset via SLC: no ladder needed after initial install - test and reset from the FACP
- Conformally coated circuit boards: resist corrosion in high-humidity duct environments
System requirements
Requires a Kidde Intelligent fire alarm control panel with an available SLC address. Sampling tubes (5 ft. standard) are supplied; optional 10 ft. tubes available for wider duct runs. Wire size 14-22 AWG.
What fire panel does the KI-DDOS require?
Does the KI-DDOS need a separate power supply?
Can the KI-DDOS replace an existing duct detector?
What air velocity range does the KI-DDOS support?
How do you test the KI-DDOS after installation?
Does the KI-DDOS include a relay for HVAC shutdown?
Spec Sheet
