dual-duct terminal unit
1. A device used to reduce the air velocity in the duct of a medium- or high-pressure, high-velocity HVAC system; incorporates a valve which controls the volume of flow for distribution of air within a room and for mixing hot and cold air.
2.See dual-duct system.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.