Cool-down box

Cool-down box, cooling box or cooling chamber is a machine that is used to cool cryopatients to liquid nitrogen temperature (77 K, −196 °C, −320 °F) before they are placed in a cryostat for long-term care. The cooling is done after perfusion, and the cooling takes a few days.

There are computer-controlled and human-controlled cool-down boxes. Since 2005, the Cryonics Institute has had two computer-controlled cooling boxes, a large one for human patients and a small one for pets and testing.