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• 2.05.3(2) During panel development, only a limited number of panel entries will be used to provide ventilation to the development phase. A three entry system will have only one intake to the right, one neutral air course in the middle, and one return to the left. The intake air course will also function as a haulage entry. A main mine fan will be provided to exhaust air outside the mine. The location of the mine fan is on the Mine Facilities Map (Map 10). Because of the compact nature of the operation, this fan should provide adequate face ventilation such that no auxiliary fans will be necessary to improve or supplement mine ventilation. Permanent stoppings will be erected between intake, return, and neutral airways outby active working sections. They will direct and separate intake, neutral, and return airflows. All inactive working areas that are not being used for haulage, travel, air courses, or extraction of coal will be sealed with explosion proof seals. in every sealed area, one or more explosive proof seals will be fitted with a pipe and a valve in order to permit air • sampling and determine the pressure on the seals. All permanent stoppings and seals will be made of fireproof materials, such as cement blocks, cinder blocks, or galvanized steel and will be constructed so as to minimize leakage. Temporary stoppings will be used in active working areas where frequent changes in air flow may be necessary. They will be constructed of jute fabric, urethane-coated jute, plastic, rough lumber covered with plastic or telescoping sheet metal sections. They will be installed so as to minimize air leakage. Overcasts will be used as necessary and will serve as an air bridge to allow two air streams to cross without mixing. They will be constructed of fireproof materials, such as concrete or steel. Where only small volumes of air are involved, pipe overcasts may be constructed. • 2.05-10 Rev. 11-30-93