This read-write integer sets the alarm threshold for how many degrees Fahrenheit the temperature may change within a 5-minute window before triggering an alarm. Admins use this to catch a rapid temperature swing, such as a sudden cooling failure, that a static high or low threshold alone might not catch quickly enough. Setting this to 5 degrees per 5 minutes would flag a fast-developing overheat event well before the absolute high-temperature threshold is even reached.