A circuit for EL panel DC offset correction is provided. The lock device may have a shackle and a cap-holding tether attachment and may be utilized with conventional security cables and locking devices to also prevent theft of the memory storage device. If the calculated outlet temperature is between the first temperature and a higher second temperature, the control system opens either the first or second damper to a fresh position, and opens the other damper to a recirculation position or the fresh position based upon relative humidity and vehicle speed.