The Siemens FDBZ492-HR is an air duct monitoring housing designed for efficient and reliable environmental sensing within ventilation systems. This model supports a 2-wire addressable setup, making it easy to integrate into existing control networks. It measures relative humidity levels from 0 to 95%, and is built to handle duct air velocities ranging between 100 and 4000 feet per minute. Built-in LED indicators provide clear status feedback, helping with quick diagnostics and system monitoring. This product is available through BSP Automation, offering a dependable solution for precise air quality and airflow monitoring in industrial HVAC applications.