Archive and Library Clean Agent Protection: NFPA 909 and Novec 1230

Museums, state archives, notaries and libraries hold cultural heritage — fire or water damage is irreversible loss. NFPA 909 (Protection of Cultural Resources) covers clean agent suppression, water mist and preaction systems used as an alternative to wet pipe. Notre-Dame 2019 and the Sao Paulo National Museum 2018 disasters underscored the importance.

Clean Agent Selection

• Novec 1230: FK-5-1-12, GWP <1 (NFPA 2001-2025 Table A.4.6) - eco-friendly, paper-safe
• FM-200: HFC-227ea, GWP 3350 (NFPA 2001-2025 Table A.4.6, IPCC 2013) - phase-down under the Kigali Amendment
• IG-541 (Inergen): N2+Ar+CO2 inert - suitable for paper, textile, film
• CO2: asphyxiant - unoccupied rooms only

Novec 1230 Design

• Design concentration: Class A minimum 4.5 percent (NFPA 2001-2025 Table A.7.2.2.3(b); use the listed system value)
• Discharge time: 10 s max (NFPA 2001-2025, 7.5.1.1)
• Hold time: 85 percent of the minimum design concentration held at the highest level of protected content for 10 min (NFPA 2001-2025, 7.4.1) - verified by door-fan test
• Cylinders: 25 bar, FK-5-1-12 agent
• Smoke detection: cross-zone (two detectors)

Water Mist (HI-FOG)

• Fine droplets: 120 bar high pressure, 10 percent of normal sprinkler water
• Evaporative cooling: extinguishes the flame front
• Cultural benefit: minimal water damage to books and documents
• Drawback: high cost, 120 bar pump house

Sprinkler Alternatives

• Preaction double-interlock: no water enters the pipes until both smoke detection and sprinkler operation occur
• Dry pipe alternative: no water in cold zones
• Glazed sprinkler: corrosion-resistant glass bulb
• On-off sprinkler: closes after fire, minimal water damage

Humidity and Climate Control

• Paper: 45-55 percent RH, 18-22 °C
• Film: 30-40 percent RH, 5-15 °C (low temperature)
• Oil paintings: 50 percent RH, 18-20 °C
• HVAC must shut down automatically on clean agent discharge, otherwise the concentration cannot be held

MEP Calc — 110+ Engineering Calculators

MEP Calc bundles 110+ engineering modules in one iOS app: 21 fire calculations (sprinkler, fire pump, FM-200 clean agent) plus heating, cooling, HVAC, plumbing, steam and natural gas. Download it on the App Store.

Download MEP Calc on the App Store

SprinkCalc — Fire Sprinkler Design Across Three Standards

SprinkCalc covers hazard classification, design density and area, K-factor selection, water demand and hydraulic calculations for NFPA 13, FM Global and BS EN 12845 in a single iOS app, and exports a professional PDF report. One of the few tools that unifies all three major fire protection standards.

Download SprinkCalc on the App Store