The three-door Blood Bank Air ciruclated Refrigerator, TC 506's housing and interior is made of galvanized sheet steel with high quality white coating. It height is at 6 feet which is adjustable. Its doors with right and left hand hinge has a three-layer thermally insulating glass and a grease resistant magnetic seal. Cleaning the interior is made easy by its rounded corners and slippery surface to meet the highest hygiene requirements. It's 75 mm thick high density foamed-in-place polyurethane gives proper insulation. Its air cooling circulation on the other hand, provides rapid and uniform temperature control and reduces temperature gradients to a minimum. Through a micro switch system, the circulating fan switches off automatically when the door is open to prevent warmer air from being drawn in.