Fire-Lite D355PL InnovairFlex Intelligent Non-Relay Photoelectric Low Flow Duct Smoke Detector, Includes SD355R Detector

Protect HVAC systems and the spaces they serve with the Fire-Lite Alarms by Honeywell InnovairFlex D355PL duct smoke detector — purpose-built for reliable, low-flow duct monitoring and fire detection. This photoelectric InnovairFlex detector delivers dependable early warning in challenging air-handling conditions, operating across air velocities of 100–4,000 feet per minute and temperatures from -4°F to 158°F. The pivoting housing accommodates round or rectangular ducts, reducing installation time and retrofit complexity for building security and surveillance systems.

Maintenance is streamlined with a tool-less sampling tube that installs from the front or back and a clear cover for quick visual checks. The unit includes the SD355R detector and runs on 24V DC, plus it supports addressable relay modules for integration into fire alarm, access control, and building automation platforms. Ideal for hospitals, data centers, schools and commercial HVAC applications, the D355PL helps meet duct protection requirements while minimizing operational disruption. Contact us to specify the D355PL for your next duct monitoring or security project and improve fire detection where air movement is a challenge.

• Reliable early smoke detection in low-flow HVAC ducts to protect critical areas like data centers and medical facilities
• Pivoting housing that fits round or rectangular ducts for faster, more flexible installation and reduced retrofit costs
• Photoelectric low-flow sensing tuned for air velocities from 100 to 4,000 feet per minute for accurate detection across variable airflow
• Tool-less front or back sampling tube installation and clear cover for fast inspection and simplified maintenance
• Broad operating range (-4°F to 158°F and 0–95% non‑condensing humidity) for dependable performance in demanding environments
• Includes SD355R detector, supports 24V DC power and optional addressable relay modules for seamless building automation and security integration