The Interpretation you are attempting to access, "does not apply to portable breathing air compressors. [1910.134(i)]", is reserved for subscribers.

Excerpt from "does not apply to portable breathing air compressors. [1910.134(i)]"
You have a question regarding portable breathing air compressors that are used to supply breathing air to a respirator. You specifically ask if an employer is required to collect samples of the breathing air generated from a portable breathing air compressor, or an electric compressor, to ensure that the compressed breathing air meets at least the requirements for Grade D breathing air.

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Internal Reference: Catcode=A221 Funcode=SZ47