From Earthship USA Inc., AIRS50 produces air as low as -76oF (-60 oC). The air-cycle refrigeration system utilizes only air, so it is CFC and ammonia free and does not emit CO2 or other chemicals that cause ozone-layer depletion. The maximum pressure inside the refrigeration system is less than 2 atm. It can be used for refrigerated/frozen food warehouses, rapid food freezing and pharmaceutical production.