Two self-contained breathing air apparatuses (SCBA), minimum 30 minutes rated, approved by the Bureau of Mines of the United States Department of the Interior, shall be kept outside the entrance to the Machinery Room. If a Group 3 Refrigerant is used, two suits of full protective clothing that meet the Occupational Safety and Health Administration (OSHA.) Fire Brigade Standard (29 C.F.R. 1910.156) must be provided and kept in the same cabinet.