When selecting and operating fan installations for main ventilation, it is necessary to take into account the following most important features of the mine ventilation network: the air moved by the units differs significantly from atmospheric air; during valve operation

Russian joint-stock company of energy and electrification "UES of Russia" Department of Science and Technology GUIDELINES FOR THE PRESERVATION OF THERMAL POWER EQUIPMENT RD 34.20.591-97 Validity period established from 07/01/97. until 07/01/2002 UDC 621.