Insulated Door Projects Insulated Doors for a Cold Storage Expansion China Project reference: Insulated Doors for a Cold Storage Expansion. Customer Challenge A cold storage operator expanded its freezer block and needed 16 dock doors holding -25 C with minimal refrigeration load. Our Solution We installed 100 mm insulated sectional doors with heated frames, thermal break tracks and rapid-cycle motors. Results Refrigeration load added by the new docks came in below the operator projection, and door frost problems were eliminated.