To achieve the rated maximum yield of up to 20 gallons per day, place the Eterna generator on a level, solid surface with at least 18 inches (45 cm) of unobstructed airflow on both lateral intake grilles and 12 inches behind the exhaust port. Ensure the ambient air temperature remains between 59°F and 104°F (15°C to 40°C) with relative humidity above 35% for continuous production.