The DESIGN of a residential refer is to have the condenser fan blow out the front bottom of the refer. So, to accomplish using the OEM rear or top refer vents would require modifying the residential flow system. Just opening up the lower back residential access panel(the one ON the refer cabinet) will not accomplish that. And, removing that panel will disrupt the correct air flow OVER and THRU the Condenser. Make sure you take into account these concerns when attempting to modify the air system. What I guess I would do is, reverse the Residential fan to PULL air from inside the RF under the refer and then exhaust it out the back or roof vent with an additional fan. BTW, I have never had a customer complain about the occasional warm air coming out the front of the refer. That air and temp is negligible. Doug