Data centres house billions of pounds of critical infrastructure. Fire suppression, detection, and resilience design must balance equipment protection with personnel safety.. Data Centre Fire Risks Data centres present unique fire safety challenges: High electrical fire risk — enormous power densities (5 30 kW per rack) Continuous operation — 24/7/365 operation with no planned downtime High asset value — equipment worth millions, but data is often irreplaceable Cooling systems — HVAC distributing airflow can also distribute smoke Detection Strategy Very Early Smoke Detection Apparatus (VESDA): Aspirating smoke detection providing 4 alarm levels Alert → Action → Fire 1 → Fire 2 Detects smoke at 0.005% obscuration (100x more sensitive than point detection) Essential for early intervention before significant damage occurs Under floor detection: Raised floor voids contain power and data cabling VESDA sampling points below floor level Grid pattern sampling for rapid location identification Suppression Options Gas suppression (most common): FK 5 1 12 (Novec 1230) — leaves no residue, safe for occupied spaces IG 55/IG 541 — inert gas blend reducing oxygen FM 200 (HFC 227ea) — being phased out due to high GWP Double knock release: requires two detector zones to activate Water mist: Increasingly specified in hyperscale data centres Lower risk of collateral damage than conventional sprinklers Effective cooling of electrical equipment No environmental impact Tier Classification and Fire Safety Tier Redundancy Fire Safety Implication Tier 1 None Single fire room can cause total outage Tier 2 N+1 Some redundancy but fire can impact capacity Tier 3 N+1, dual path Concurrent maintainability; fire isolated to zones Tier 4 2(N+1) Fault tolerant; fire in any single zone has no impact Operational Considerations Hot aisle/cold aisle containment affects smoke detection performance Emergency Power Off (EPO) — controversial; some operators prefer to keep power on Lithium ion UPS batteries replacing lead acid — different fire risk profile Cable management — fire rated cable trays and cable transit systems For data centre fire engineering, contact us. Magnus Opifex SEVEN LTD — UK's Leading Fire Safety & Fire Engineering Consultancy 🌐 magnus opifex.co.uk 📞 +44 7486 691724 ✉️ office@magnus opifex.co.uk Founders: Nicoleta Vasile, Baroness of Brattleby — CEO, Lawyer and Barrister, Legal & Administrative Director Alina — Technical Director & Expert Fire Engineer (BEng) Head Office: Ealing Cross, 85 Uxbridge Road, London W5 5BW Magnus Opifex SEVEN LTD delivers engineering led fire engineering, fire risk assessments, CFD modelling, and building safety consultancy across the United Kingdom and internationally. With over 20 years of combined experience and a UK portfolio spanning healthcare, residential and infrastructure, we bring truly engineered solutions with a personal touch. © 2026 Magnus Opifex SEVEN LTD. All rights reserved.