An air curtain should be mounted just above the top of the doorway or doorjamb, as close as possible without obstruction. Mounting the unit too high reduces its effectiveness, while mounting too low may interfere with pedestrian or equipment clearance.

If there is an obstruction preventing direct mounting above the door, the unit should be moved outward by 1 inch for every 3 inches it is mounted above the doorjamb. This ensures that the airstream clears the frame properly and avoids turbulence, maintaining a smooth and effective air barrier.