The Fire Industry Association (FIA) has issued guidance to help navigate the complexities of post-discharge ventilation (PDV) and ensure effective implementation. PDV is a crucial component following the activation of a gaseous fire extinguishing system. It ensures that the environment is cleared of any harmful residues, allowing for safe re-entry and preventing potential re-ignition of fires. While the need for PDV is often recognized, it is distinct from pressure relief systems, though they can sometimes be integrated.

Key considerations for PDV implementation

When planning for PDV, the responsibilities fall on the system designer or certifier. The installation and management of PDV should be part of a broader risk assessment for the gaseous extinguishing system. The decision between natural or forced ventilation must be made with care, often requiring external expertise beyond the system designer’s capabilities.

Best practices and compliance

ISO 14520 and EN 15004 emphasise the necessity of prompt natural or forced-draft ventilation following a system discharge. While fixed ventilation systems are not mandated, portable arrangements can be acceptable, provided they are capable of thoroughly evacuating the discharged agent.

For more detailed technical guidance and to ensure compliance with PDV requirements, download the FIA Guidance Document.

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