Blood bank refrigerator LB-21BSR is an upright single glass door refrigerator with electronic temperature controller. Forced-air cooling causes uniform air circulation for optimized airflow. Electronic temperature controller renders reliable temperature uniformity. Automated defrost cycles facilitate frost-free storage interiors. Steel exterior with polyurethane insulation ensures low energy consumption and im-permeability. System features open door, high or low temperature, battery fail, temperature control error and power failure alarm.