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B, AUXILIARY FANS ~ ~ ' ~•' <br />~'• 1. The volume.of intake air delivered to the tan prior to the start-up <br />of the fan shall De greater than the volume of air the fan is capa- <br />ble of producing in the current set-up, <br />2, Positive airflow shall be maintained through all entries in addition <br />to the air passing through the tubing to carry away methane, dust <br />and diesel exhaust products. <br />3. Auxiliary farts shall be examined by a qualified person immediately <br />after start-up and once every four hours thereafter to determine if <br />the tan is operating properly, to check for recirculation, and to <br />check for positive airflow through affected entries. The examiner <br />shall place his initials, time, and date of the examination near the <br />fan or at the face of the place being ventilated, <br />4, The manufacturer, model number, horsepower, rpm, blade position, and <br />free disc ha rye capacity of the fan will be indicated for each auxil- <br />iary fan used underground on the mine map. fie size and type of <br />vent tubing will also be identified on the mine map. The maximum <br />length of tubing to be used with any one fan will be 300 feet if <br />used for cutting, mining or loading coal and 500 feet if for venti- <br />lating idle faces that require perceptible air movement. <br />5, Sketches showing typical fan and tubing locations are included in <br />typical mining system drawings. Information on use of tubing while <br />mining or roof bolting is included in the appropriate portions of <br />this plan, <br />6, Tubing will De extended from the face to the auxiliary fan located <br />in the crosscut or outby the last open crosscut or line brattice ex- <br />tended to the last open crosscut from the face to provide percepti- <br />ble movement during periods when the fan is not operating. <br />• <br />Initial 11/O]/86 <br />