phrase
General Slang
two-in, two-out
· phrase · firefighter
OSHA rule: two firefighters inside an IDLH fire, two staged outside ready to rescue them.
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Definitions
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The minimum staffing rule for interior structural firefighting: any two members who go inside an IDLH atmosphere must have at least two more outside, in full PPE on air, ready to drag them out if it goes wrong. Exception is a known life rescue.
“We held at the door until the second engine arrived — couldn't make entry without two-in, two-out covered.”
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two-in, two-out In A Sentence
We held at the door until the second engine arrived — couldn't make entry without two-in, two-out covered.
Origin & Usage
US OSHA respiratory-protection rule (29 CFR 1910.134(g)(4)), adopted into fire-service practice in the late 1990s. Interior firefighting at an IDLH atmosphere requires a minimum of four trained, equipped personnel — two working, two standing by as rapid-intervention.
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