This Ventilator Kit can be installed to enhance the cooling performance of your Thetford refrigerator in difficult circumstances like very high ambient temperatures. The Ventilator Kit will help to force out the warm air in the combustion area behind the refrigerator through the upper vent. That way, 'cooler? air can enter the combustion area through the lower vent and enhance the performance. The ventilator can be installed on all Thetford fridges. Installation manual included.