regular ventilating circuit

regular ventilating circuit

[′reg·yə·lər ′vent·əl‚ād·iŋ ‚sər·kət]
(mining engineering)
All places in the mine through which there is a positive natural flow of air.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.