We just recently had the following counter/cabinet system put into our basement family room. After everything was done, I started to get concerned about airflow. The enclosure was built in such a way that I can easily slide the fridge (left) and the freezer (right) in and out to service. I noticed after a few days of running that the sides of the fridge get extremely hot at times but is relatively cool at others. The freezer seems to not have any heat on the sides at all though.
Would it be wise to install some type of ventilation system? I wouldn't be able to vent outdoors since the wall this is against is an exterior basement wall but I was thinking of possibly using some type of exhaust fan system (I found a couple that are typically used to ventilate entertainment systems that hold high-heat gaming consoles and equipment) to run through the kick board layer under the cabinets and out the sides into the room.
Most people I asked say "don't worry about it, it's fine" but I want to know for sure. I am not as much worried about limiting the lifespan of the appliances as I am about safety. Could this cause a fire or am I just being paranoid?