Fire Detection in High Airflow Applications

High airflow environments such as data centres, cleanrooms, and advanced manufacturing facilities demand a fire detection strategy that goes beyond standard solutions. In these settings, smoke can be rapidly diluted and dispersed, making conventional point detectors too slow, or even completely ineffective.

Astro Fire Systems designs and delivers fire detection systems engineered specifically for high airflow conditions. We apply technologies like VESDA, advanced aspirating smoke detection, and airflow-aware design strategies to ensure reliable, early-warning protection where it’s needed most.

The Challenge of High Airflow

In critical facilities, air handling systems are used to manage heat and maintain environmental stability. However, this constant and often high-speed airflow presents a unique challenge for fire detection:

  • Smoke is diluted before reaching traditional ceiling-mounted detectors.
  • Airflow can redirect or remove smoke, preventing accumulation in detection zones.
  • Heat signatures are reduced, affecting heat-based detection accuracy.

The result? Fires may go undetected until it’s too late, unless your system is purpose-built for the environment.

VESDA: Very Early Smoke Detection Apparatus

At the heart of many of our high-performance solutions is VESDA - a market-leading aspirating smoke detection (ASD) system designed for early fire detection in complex airflow conditions. VESDA systems:

  • Continuously draw air samples through a network of precision-engineered pipes.
  • Detect even sub-microscopic particles of smoke - long before they are visible or produce heat.
  • Are highly configurable for sensitivity, zoning, and alarm thresholds, supporting both early warnings and critical suppression triggers.

This makes VESDA an ideal choice for server rooms, telecom hubs, and mission-critical IT environments, where downtime and data loss are unacceptable risks.

Design Matters: Tailored Detection for Airflow Dynamics

Using guidance from BS 6266, BS 5839-1, and FIA’s Fire Detection in High Airflow Environments, our approach goes beyond just installing detectors. We engineer systems based on:

  • Airflow mapping – direction, speed, and distribution across cold and hot aisles or pressure zones.
  • Detector placement – prioritising return air vents, hot aisles, and voids used as plenums, not just ceilings.
  • Sensitivity tuning – optimised to detect smoke even when highly diluted by clean or filtered air

Comprehensive Detection Technologies

Depending on the application, Astro Fire Systems may deploy:

  • VESDA and other ASD systems – for ultra-early, highly sensitive detection.
  • Optical smoke detectors – especially forward-scatter types, effective for smouldering fires.
  • Multi-sensor detectors – in lower airflow zones, combining smoke, heat, and CO detection (used with caution in high airflow zones).
  • Redundant detection zones – to ensure both operational and “still-air” detection coverage.

This layered approach is critical in settings like cleanrooms, where airflow is essential to function—but cannot compromise fire safety.

Built for Performance, Backed by Expertise

Astro Fire Systems works closely with consultants, IT managers, and facility designers to ensure your fire detection strategy is aligned with your airflow dynamics, operational needs, and compliance requirements.

We don’t just protect infrastructure - we safeguard uptime, productivity, and peace of mind.