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2.05.3(2) In order to prevent short circuiting, mine doors may be installed in pairs in certain areas to form an airlock. Various stoppings throughout the mine will be equipped with a man door or drop door to allow access to the entries which have been sealed off by stoppings. These doors will be carefully built so as to minimize leakage. Bulk travel curtains and brattice will direct the flow of air from the intake across the working faces and into the return entries. The overall circulation of air through the mine will proceed in the following manner: An externally mounted exhaust fan will create a negative pressure and draw air into the mines through the intake portal. Intake air will then be directed through the mine by stoppings, overcasts and regulators to the working faces of each mine section or working panel. At the working face of the continuous miner section, brattice and curtains, or auxiliary fans and tubing, will be used to direct intake air through the working • faces and into the return air. Neutral air will not sweep across the working faces but will be directed by stoppings and a regulator into return air courses. The return air from each section will be directed by stoppings, overcasts, and regulators to an existing return entry to be exhausted through the fan into the open air. Roof Suoaort. Roof control will be based on a conventional spot bolting plan approved by the Mine Safety and Health Administration; conventional supplemental materials and supports will be used as necessary. During mine development throughout the old Edwards Mine, timbers with cap blocks and wedges will be installed as necessary down roadways and crosscuts. Depending upon the conditions encountered, other supplemental and temporary supports such as metal posts, jacks or cribs in conjunction with wooded cap blocks, footers, planks and beams will be installed as needed, n LJ 2.05-11 Rev. 11-30-93