Cold storage systems and shelving assemblies therefor

A cold storage system comprising:

• a housing that defines a chamber, the housing including an outer door configured to provide access into the chamber;
• a refrigeration assembly coupled to the housing that is configured to achieve an ultra-low temperature within the chamber via forced convection;
• a plurality of shelves vertically spaced from one another within the chamber to provide airflow gaps between the shelves, each shelf of the plurality of shelves comprising a plurality of guides that are laterally spaced from one another to define airflow openings vertically through each shelf individually, wherein each of the plurality of guides includes a planar guide surface;
• a plurality of interior doors positioned within the chamber, each of the plurality of interior doors being aligned with a corresponding shelf of the plurality shelves and configured to transition between:
• a closed position in which the interior door occludes the corresponding shelf and obstructs airflow from the corresponding shelf out of the chamber when the outer door is open;
• and
• an open position in which the interior door is pivoted from the closed position to expose the corresponding shelf;
• and
• a plurality of storage pans supported on the plurality of guides in each of the plurality of shelves, wherein each of the plurality of storage pans is configured to slide out from the corresponding shelf to be at least partially supported by a corresponding interior door of the plurality of interior doors when the corresponding interior door is in the open position,
• wherein each of the plurality of storage pans includes a V-shaped runner extending along a bottom side of the storage pan that is configured to slidably engage with the planar guide surface of a corresponding one of the plurality of guides, and
• wherein the V-shaped runner of each of the plurality of storage pans comprises a metallic frame and an engagement ski coupled to the metallic frame that comprises polytetrafluoroethylene (PTFE).