Simplex 565-925 4098-9756 4-Wire Duct Smoke Detector Replacement PC. This high-performance replacement printed circuit board ensures reliable life-safety monitoring for your existing HVAC duct detection systems. - 4-wire configuration - Direct replacement design - Industrial-grade circuitry - New in box condition - Integrated fire detection compatibility

This replacement component is precision-engineered to restore full functionality to your duct smoke detection hardware, offering a seamless upgrade over aging or malfunctioning control boards. Unlike generic aftermarket alternatives, this unit maintains strict adherence to the operational standards required for critical facility fire alarm systems, ensuring consistent sensitivity and rapid response times within ventilation ducts.

Advanced Detection Circuitry

Built with robust internal components, this 4-wire replacement board provides superior signal stability compared to legacy models, effectively reducing false alarms while maintaining high-sensitivity air monitoring. Its design optimizes the electrical path for faster processing of smoke detection signals, providing a dependable interface that integrates perfectly with established fire safety infrastructures. The unit features high-durability solder points and heat-resistant board architecture to handle the demanding environments of commercial HVAC ductwork, ensuring long-term operational integrity and compliance with rigorous life-safety performance benchmarks.