[Code of Federal Regulations] [Title 42, Volume 1] [Revised as of October 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 42CFR84.52] [Page 517] TITLE 42--PUBLIC HEALTH CHAPTER I--PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES PART 84_APPROVAL OF RESPIRATORY PROTECTIVE DEVICES--Table of Contents Subpart F_Classification of Approved Respirators; Scope of Approval; Atmospheric Hazards; Service Time Sec. 84.52 Respiratory hazards; classification. Respirators described in subparts H through L of this part shall be classified as approved for use against any or all of the following respiratory hazards: (a) Oxygen deficiency; (b) Gases and vapors; and (c) Particles, including dusts, fumes and mists.