airfoil vane

turning vane

turning vanes
One of a number of curved fins which are placed in air-conditioning ductwork at a point where the duct changes direction; used to promote a more uniform airflow and to reduce pressure drop.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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For example, checking airfoil vanes to within 0.0005" profile using gages or a comparator with mylar overlay were not easily achievable.