For narrow ventilators, how many holes and what diameter must they have?

The correct specifications for narrow ventilators state that they must have nine holes, each with a diameter of 10mm. This design ensures effective airflow and proper ventilation within dry vans, which is essential for the preservation of temperature-sensitive cargo and prevention of moisture buildup that could compromise the integrity of the goods being transported.

Using the specified number and size of holes also aligns with standard practices and industry guidelines, which help to ensure that ventilators efficiently perform their intended function without introducing structural weaknesses to the dry van. Properly designed ventilators are critical for maintaining the appropriate internal environment necessary for various types of cargo, especially in challenging weather conditions.