ILR in the Cold Chain means Ice Lined Refrigerator. It is a specific type of refrigerator meant to maintain constant temperature between +2°C and +8°C and store safely the vaccines, blood bags, and other biological samples. The main difference between an ordinary refrigerator and an Ice Lined Refrigerator is that the latter has ice packs or ice lining in the chamber to maintain the ne... https://www.bionicsscientific.com/laboratory-refrigerator/ice-lined-refrigerator.php