![System Sensor D4120 Innovairflex Duct Smoke Detector Photoelectric Sensing Indoor 24v 31633 | AC Pro Store | HVAC Equipment, Parts & Supplies for Contractors System Sensor D4120 Innovairflex Duct Smoke Detector Photoelectric Sensing Indoor 24v 31633 | AC Pro Store | HVAC Equipment, Parts & Supplies for Contractors](https://cdn.gateway.acpro.com/original/system-sensor-d4120-duct-smoke-detector-1_original.jpg)
System Sensor D4120 Innovairflex Duct Smoke Detector Photoelectric Sensing Indoor 24v 31633 | AC Pro Store | HVAC Equipment, Parts & Supplies for Contractors
InnovairFlex™ D4120 4-Wire Duct Smoke Detector | Smoke Detectors | Sensors | Smoke Detectors | Honeywell Building Solutions
![Silmar Electronics - 4-Wire Photoelectric Duct Smoke Detector - D4120 | Silmar Electronics �" Wholesale B2B Distributor of Security Systems - Conventional - Silmar Electronics - Conventional Silmar Electronics – Wholesale B2B Distributor of Security Systems Silmar Electronics - 4-Wire Photoelectric Duct Smoke Detector - D4120 | Silmar Electronics �" Wholesale B2B Distributor of Security Systems - Conventional - Silmar Electronics - Conventional Silmar Electronics – Wholesale B2B Distributor of Security Systems](https://www.silmarelectronics.com/images/products/large/D4120.jpg)