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air curtain

noun
1.

air door

noun
1.
a strong current of temperature-controlled air in an entryway, used instead of a door.
Also called air curtain.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for air-curtain

air curtain

noun
1.
an air stream across a doorway to exclude draughts, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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3
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