Are there any air flow openings in the compartment where the refrigerator is? I am told the refrig is a Isotherm Elegance 85. That company wants air flow in and out but perhaps it works ok without the flow. (I ask this because i am buying an older 309 and Catalina tells me the same refrig can be used in both, yet there are no openings in the compartment for the 309 (apparently having the same compartment dimensions)