Directional vanes allow the air stream to be angled slightly **inward or outward**, depending on the application and environmental conditions. This adjustment is critical for ensuring the airstream reaches the floor effectively and maintains a complete seal across the doorway.

In most cases, the air should be angled **15–20 degrees toward the draft** — typically outward — to counter incoming air pressure. This is how Miniveil air curtains are preset at the factory for optimal performance.

However, in specialized applications — such as insect control or industrial ovens — this angle may need to be manually adjusted on-site to suit specific airflow patterns and containment needs.