To estimate your enclosure's heat load, please follow these measurement guidelines: The enclosure must be 100% sealed with no ventilation When measuring the temperature, the equipment should be operated at 100% duty Use calibrated thermometers for measuring the temperatures The internal thermometer should be located in the center of the enclosure The external thermometer should be 20 ft. away from the enclosure Allow the thermometers to reach a steady state If you cannot apply these guidelines, please contact Thermal Edge for assistance.