A refrigeration appliance comprises a fan mounting assembly mountable to a liner of a cabinet. The fan mounting assembly comprises a bracket, a first member of a first snap coupling on the bracket for receiving a corresponding second member of the first snap coupling on an evaporator coil cover, and a mounting flange having a first member of a snap lock extending from the bracket for mounting the fan mounting assembly to the liner of the cabinet. An evaporator coil cover for mounting to the fan mounting assembly comprises a second member of the first snap coupling allowing the evaporator coil cover to be coupled to the fan mounting assembly, and a first slot. An air tower assembly mountable to the fan mounting assembly through the first slot comprises a second member of a second snap coupling and a second member of a third snap coupling.