Thermo Scientific REB1204A has a positive, forced air circulations system for maximum temperature uniformity and a directional airflow for rapid temperature recovery. Its high-density, CFC-free urethane foam insulation protects cabinet from ambient temperature fluctuations and minimize operating costs. It digital electronic technology designed to simplify operation and deliver greater accuracy is preset for 4 Deg C operation while its adjustable temperatures range from 1 Deg and 8 Deg C. Its sensor automatically initiates defrost cycle on demand, eliminating need for a defrost timer, minimizing frost buildup, and optimizing coil efficiency. This blood bank refrigerator features cold-rolled steel cabinets with smooth, scratch-resistant painted finish for easy cleaning and lockable doors self-closing against closed-cell peripheral gasket, adjustable, full-extension, stainless-steel drawers and more. Its special construction and incorporated features enables this unit for heavy duties hassle free operation giving you much space and reliability for your temperature sensitive products, especially blood bags.