Air curtain

a strong current of temperature-controlled air in an entryway, used instead of a door.
Historical Examples

The big man with the tiny child on his shoulder pushed through the air curtain that kept the warm humid air out of the shop.
Anything You Can Do … Gordon Randall Garrett

Opposite the air curtain was a huge sliding door, closed at the moment, which probably led to a freight elevator.
Unwise Child Gordon Randall Garrett

an air stream across a doorway to exclude draughts, etc


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