air curtain

WordReference Random House Unabridged Dictionary of American English © 2026

air′ cur′tain, 

1. Mechanical Engineering compressed air directed, usually downward, across a doorway so as to form a shield to exclude drafts, insects, etc.

Collins Concise English Dictionary © HarperCollins Publishers::

air curtain noun

1. an air stream across a doorway to exclude draughts, etc