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1. In an air-conditioning system, a major duct or pipe for distributing to or collecting from various branches.
2. In any system of continuous piping, the principal artery of the system to which branches may be connected.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
"Strong car speed will be important at the Desert 400 with the FPR Falcons reaching 270 kph at the end of the long Bahrain International Circuit main straight, which leads directly into a hairpin corner," said Richards.