Fully integrated refrigerators and freezers have specific ventilation requirements which are imperative for correct operation.  Ventilation requirements differ depending on the model; ECBN & UIK/UIG models have built-in ventilation grills in the plinth while all other integrated refrigerators and freezers require ventilation to be installed above and below the appliance (see below video).  It is essential that installers ensure minimum ventilation is provided in accordance with the installation manual that accompanies the actual appliance.