A/20K-R - 20K Ohms @ 77 Deg F (25 Deg C). Options include LCD. ACI's room enclosures combine option flexibility with attractive styling and they have four-way airflow to minimize self heating. 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. Example Part Number: A/20K-R-LC Negative temperature coefficient4-Way airflow