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Section (g)(4) of OSHA's Respiratory Protection Standard, 29 CFR 1910.134, which requires that for safety, 2 persons entering a dangerous atmosphere must remain in constant contact with one another, and 2 persons must remain outside the danger in order to monitor those inside and perform rescue or call for backup if needed.
- 2-In 2-Out
- Two In Two Out
- Two-In Two-Out