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Apple's Civil Defense Store
Human defense fortification for storing apples must be equipped with a corresponding blower and exhaust fan according to the size of its area, and the total power is calculated to be 1 kW per square meter. Blowers and exhaust fans are installed at the corresponding two ends, and the power, air volume, and air pressure are the same. The air defense equipment without ventilation equipment should not store apples, even if the temperature is appropriate, it will also accelerate the aging of the fruit, and the good fruit rate is very low. The key to managing the use of civil defense fortifications is to make full use of external cold sources for cooling. When the outside temperature is lower than the internal temperature, the exhaust fan is opened for half an hour before the blower is opened; when the temperature difference between inside and outside is less than 2°C, the ventilation has no cooling effect. When ventilation is conducted during the winter season, it is necessary to check the fruits near the air ducts, and to cool them under the premise of avoiding frostbite. The humidity of air defense fortifications is high and care should be taken not to sprinkle water easily. Excerpt from: "Guoshu storage preservation processing Daquan"