The Interpretation you are attempting to access, "Correct placement of air sampling cassettes on employees performing welding operations.", is reserved for subscribers.

Excerpt from "Correct placement of air sampling cassettes on employees performing welding operations."
In your letter you have asked for a formal response regarding the correct placement of an air sampling cassette on employees performing welding operations while wearing a supplied air breathing ensemble. 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