The Interpretation you are attempting to access, "Correct placement of air sampling cassettes on abrasive blasters.", is reserved for subscribers.

Excerpt from "Correct placement of air sampling cassettes on abrasive blasters."
The correct placement for air sampling cassettes is near the breathing zone of the employee. It should be as close as possible to the nose and mouth of the employee, i.e., in a hemisphere forward of the shoulders with a radius of 6 to 9 inches.

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Internal Reference: Catcode=A221 Funcode=SZ47