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This document provides test or calculation methods to assess thermal insulation performances for customized walk-in cold rooms and components under normal end-use conditions. The normal end-use conditions of a walk-in cold room are considered to be: - installation inside an existing building; - not exposed to external weather conditions; - internal side of panels subject to temperatures within the indicative range -40 °C ≤ T ≤ 12 °C; - external side of panels subject to temperatures within the indicative range -8 °C ≤ T ≤ 30 °C; temperatures below 0 °C, or higher than 20 °C, can be reached if the walk-in cold room is located inside not air-conditioned premises. NOTE In case the customized walk-in cold room working at positive storage temperature is used as a food processing room or a clean room, the standard is applied.