| Alarm Type | : | Audible~Visual |
| Compatible Models | : | D4S |
| Depth | : | 14.38 in |
| ETL Listed | : | No |
| Function Type | : | Smoke Detector |
| Height | : | 2.5 in |
| Installation / Mounting Type | : | Duct Mount |
| Operating Temperature Rating | : | -4-158 F |
| Package Quantity | : | 1 |
| Packaged Depth | : | 15.4 in |
| Packaged Height | : | 4.3 in |
| Packaged Width | : | 5.55 in |
| Power Source | : | Electric |
| Product Family | : | InnovairFlex |
| Product Type | : | Photoelectric Duct Smoke Detector |
| Product Weight | : | 2.5 lbs |
| Shipping Weight | : | 3.06 lbs |
| UL Listed | : | Yes |
| Voltage Rating | : | 24~120 V |
| Wi-Fi/Smart Home Enabled | : | No |
| Width | : | 5 in |
The InnovairFlex D4120 is a 4-wire photoelectric duct smoke detector designed for dependable monitoring of HVAC systems. This unit is engineered to detect smoke in challenging duct environments while offering flexibility to overcome common mounting constraints in new construction or retrofit jobs.This detector simplifies setup with features like field-selectable settings and high-contrast terminal designations. It includes built-in short circuit protection against wiring errors and offers 2:1 sensor-to-power capability, allowing the power board to monitor a second D4S sensor for a cost-effective solution in supply and return duct applications.