The Interpretation you are attempting to access, "Belt mounted filtration unit used with any NIOSH approved supplied-air respirator.[1910.134]", is reserved for subscribers.

Excerpt from "Belt mounted filtration unit used with any NIOSH approved supplied-air respirator.[1910.134]"
regarding your belt mounted filtration unit to be used with any National Institute for Occupational Safety and Health (NIOSH) approved supplied - air respirator. You are seeking Occupational Safety and Health Administration (OSHA) acceptance of this device to further assure Grade D air that is delivered by a compressor, by allowing the interruption of an approved respirator system to insert your belt - mounted system.

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Internal Reference: Catcode=A221 Funcode=SZ47