Hospital OR and ICU: Special Fire Protection

Hospital fire protection follows defend-in-place, not wholesale evacuation. The operating room (OR) and ICU are the most sensitive zones: patients cannot be moved, life support must keep running. NFPA 99 Health Care Facilities Code and NFPA 101 treat these as special sections. Ignition, oxygen-rich atmosphere and medical gas mixtures make OR fire risk uniquely combinatorial.

OR Fire Triangle

The OR triangle:

• Fuel: Alcohol-based skin prep, drapes, dry gauze
• Oxidizer: 100% O2 atmosphere (near patient mask)
• Ignition: Electrosurgery (monopolar), laser, fiber-optic light

US FDA/ECRI: ~200-240 OR fires per year from this combination.

Medical Gas Shutoff

OR gas lines must shut off immediately in an emergency:

• Zone Valve Box (ZVB): Visible and accessible outside each OR
• Shut-off gases: O2, N2O, medical air, vacuum
• Labeling: Color-coded, with emergency contact listed
• Testing: NFPA 99 requires annual full test

Sprinkler vs Alternatives

Water-based sprinklers in OR are controversial — sterile contamination and equipment damage. Alternatives:

• Standard wet-pipe: NFPA 13 + NFPA 101 recommend it; water damage accepted
• Pre-action: Cross-zoning eliminates false trips
• Clean agent (FM-200, NOVEC 1230): Electronic rooms; rare in OR
• Water mist: 80% less water, suppresses without drenching sterile field
• Portable extinguisher: Saline-filled CO2 or water-mist size

Smoke Compartments

NFPA 101 Ch. 18/19 smoke compartment rules:

• Each smoke compartment ≤2,300 m2 (25,000 sq ft)
• Walls smoke-tight, ≥2-hour fire resistance
• Each patient area has access to 2 separate smoke compartments
• ≤30 beds per smoke compartment
• Corridor ≥2.4 m wide (horizontal evacuation)

Operational Readiness

1. RACE protocol: Rescue, Alarm, Confine, Extinguish — all OR staff trained
2. PASS: Pull, Aim, Squeeze, Sweep (extinguisher use)
3. Fire drill: Quarterly, each OR/ICU team
4. Evacuation vs shelter: Shelter for 18/19, partial evac for 32+
5. Fire door testing: NFPA 80 annual auto-close test

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