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• USE OF AUXILIARY FANS <br />1. All auxiliary fans used underground <br />type, maintained in a permissible <br />operated to avoid any recirculation <br />every four hours during each working <br />place his initials, date, and time <br />tubing will be hung. <br />will be of a permissible <br />condition, so located and <br />of air, and examined once <br />shift. The examiner will <br />near the fan, Fans and <br />2. Auxiliary fans or the discharge end of tubing will be installed <br />either in the return airways from the face areas to be venti- <br />lated or at each entry along the last open crosscut. The vol- <br />ume of air available at the entrance to the place to be venti- <br />lated with auxiliary fans shall De greater than the free air <br />discharge capacity of the fan, <br />3. The manufacturer, model number, horsepower, rpm, blade posi- <br />• Lion, antl free discharge capacity of the fan will be indicated <br />for each auxiliary fan used underground on the mine map. The <br />size and type of vent tubing will also be identified on the <br />mine map, The maximum length of tubing to be used with any one <br />fan will be 300 feet if used for cutting, mining or loading <br />coal and 500 feet if for ventilating idle faces that require <br />perceptible air movement. <br />• <br />Page kineteen <br />Revised 04/13/81 <br />Revised 05/27/81 <br />Revised 06/1D/81 <br />