A/3K-R2O - 3K Ohms@ 77Deg F (25 Deg C) Thermistor. ACI's room enclosures combine option flexibility with attractive styling and they have four-way airflow to minimize self heating . Includes override option. ACI room temperature sensors are designed for HVAC or Building Automation Systems. Specific applications include: zone control office and work space auditoriu conference room and hallways. Negative temperature coefficient4-Way airflo Night setback