This read-only enumerated value reports the expansion cabinet's temperature status as OK(2), critical(3) for a serious temperature condition, non-critical(4) for a warning-level reading, not installed(5), or unknown(6). An administrator monitors this separately from the primary enclosure's temperature status since the expansion cabinet may sit in a different physical location with its own airflow. A critical(3) reading here would require checking the expansion cabinet specifically, even if the primary enclosure's temperature remains normal.