A/1.8K-R2 - 1.8K Ohms @ 77 Deg F (25 Deg C) ACI's R2 (Aries) enclosures combine option flexibility with attractive styling and they have four-way airflow to minimize self heating. Options include setpoint override and communication jack. 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 airflow