# Standard Interpretations
1 - 1910.134(g)(4) - Classification of fires; respiratory protection to extinguish fires.
2 - 1910.134(g)(4) - Complying with the "two-in, two-out" policy for interior structural firefighting.
3 - 1910.134(g)(4) - Respiratory protecton standard two-in/two-out policy.
4 - 1910.134(g)(4) - Two-in/two-out rule for interior structural fire fighting.
5 - 1910.134(g)(4) - Two-in/two-out procedure in firefighting/IDLH environments.
6 - 1910.134(g)(4) - The interpretation of the OSHA standards 1910.134 and 1910.156 which address the requirements for workers who are actively conducting operations in atmospheres that are immediately dangerous to life and health.