053-3 Wyo. Code R. § 57.22205
Current through April 27, 2019
In mines ventilated by multiple main fans, each main fan installation shall be equipped with noncombustible doors. Such doors shall automatically close to prevent air reversal through the fan. The doors shall be located so that they are not in direct line with explosive forces which could come out of the mine.
053-3 Wyo. Code R. § 57.22205