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July 27. 2015 <br />Twentymile Coal Co. <br />29515 Co Rd 27 <br />Oak Creek, CO 80467 <br />Attn: Mike Berdine <br />KSD Enterprises, LL C <br />www.ksdenterprises.com <br />PO Box 747 <br />Clarksburg, WV 26302 <br />304-624-7452 <br />ksd@ksdenterprises.com <br />Project Ref: Electric Driven Methane Exhauster <br />Dear Mike, <br />We appreciate your consideration for your methane extraction needs. <br />Following is our recommendation for the exhauster necessary to meet your <br />performance requirements: <br />Performance: 5200 ICFM @ 7.5 " Hg vacuum +0 Outlet <br />7500 FASL, 68 F, Air, -12 Wg at inlet <br />Quantity Model <br />2 NT122206 Multistage Centrifugal Exhauster <br />Each exhauster shall have cast iron inlet and <br />Outlet heads, cast iron intermediate sections, <br />and cast aluminum -alloy, shrouded type <br />impellers. Each impeller shall be mounted <br />on a heavy steel shaft supported by two ball <br />bearings, grease lubricated. Each exhauster <br />shall be mounted on a structural steel base <br />plate, direct driven through a flexible coupling <br />by the motor specified below. <br />Motor Saecification: <br />2 125 HP @ 3600 RPM, Supplied by Twentymile. <br />The following items are included: <br />