C.F.R. » Title 42 » CHAPTER I—PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES › SUBCHAPTER G—OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES › PART 84—APPROVAL OF RESPIRATORY PROTECTIVE DEVICES › Subpart I—Gas Masks

42 C.F.R. § 84.112

Canisters and cartridges in parallel; resistance requirements

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Where two or more canisters or cartridges are used in parallel, their resistance to airflow shall be essentially equal.