BERKELEY - The National Institute for Occupational Safety and Health has upgraded its respirator certification standards from those of Part 11 to those of Part 84. (See NEWS p. 00-6403.) However, respirators certified under Part 11 can still be used. On June 20, 1996, the safety research division in West Virginia issued a notice to remind users of the requirements for a comprehensive respiratory protection program and advised them of the differences and limitations between Part 11 particulate respira
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