Air is sprayed out through one or more rows of holes on the duct to form a very stable directional airflow. The opening distributes air evenly along the entire length of the duct, ensuring a high level of comfort. The opening ensures that air is expelled perpendicular to the duct. This pattern is suitable for distributing hot and cold air. Range can range from medium range to very long range. The holes can be placed anywhere on the duct surface so that the air after air-conditioning is blown to where it is needed.
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