energy- and cost-efficient ventilation for alaskan mine Case study Canary birds are especially sensitive to methane and car- bon monoxide and at one time were regularly used in coal mining as an early warning system: any signs of distress from a bird indicated to the miners that conditions were unsafe. Today’s mines are ventilated. Using VACON ® AC drives to control fans and blowers at a mine in Alaska has significantly improved the energ

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