Which phrase best describes the proper use for a refrigerated box using a cap tube system?

The phrase that best describes the proper use for a refrigerated box using a cap tube system is "display fridge." Capillary tube systems are commonly utilized in lower capacity refrigeration applications, particularly for display cases that require precise temperature control to maintain the quality and safety of perishable items.

Display fridges are designed to keep food products at optimal temperatures while also being visible to customers, thereby enhancing merchandising. The capillary tube system is suitable for these applications due to its simplicity, efficiency, and ability to maintain stable cooling in a display environment where continuous access to the stored items is expected.

In contrast, storage freezers and blast chillers require more robust and complex systems to handle the demands of freezing products quickly and maintaining lower temperatures for longer periods. Cold rooms, while they utilize refrigeration systems, often require larger capacity units or more complex systems than what a capillary tube can provide effectively. Therefore, the characteristics of a display fridge align perfectly with the capabilities of a refrigeration system utilizing a capillary tube.