dimensioned and positioned such that when inserted within the shell 28 certain external gaps 30 that are to be filled with insulating material such as foam exist between an interior wall 32 of the shell 28 and a side of the compartment liner 24 or 26 depending on the arrangement of the compartment liner 24 or 26 the external gaps 30 may be formed at the top bottom or side of the compartment liner 24 or 26 as shown in fig2 3 the first compartment liner 24 and the second compartment liner 26 are also spaced apart from one another inside the shell 28 by placing a set of beam like elongate supports or inserts 34 between the two compartment liners 24 26 thus forming the mullion section 22 fig1 while the present embodiment includes two elongate supports 34 it may be possible to use three or more elongate supports to space the compartment liners 24 26 apart as shown in fig4 5 the first compartment liner 24 includes a first liner face 36 and the second compartment liner 26 includes a second liner face 38 the first liner face 36 and the second liner face 38 may be substantially similar in dimensions as in the present embodiment the first liner face 36 and the second liner face 38 are arranged to be adjacent and face one another when the compartment liners 24.