MGN 657 (M+F) Amendment 1 Requirements for Fixed Aerosol Fire Extinguishing Systems for use in Small Vessel Machinery Spaces

by | Dec 2, 2025 | Fire fighting systems, protection, Machinery, Marine, MCA, UK

The MCA has published guidance outlining the approval, installation and maintenance requirements for fixed aerosol fire-extinguishing systems used in small-vessel machinery spaces that are not normally occupied.

It explains that only systems tested and certified by a UK-Approved Body – using full-scale fire tests and strict performance criteria – can be installed, and sets out rules for calculating design concentration, fitting equipment correctly, and ensuring it is safe, effective and environmentally compliant.

The notice also covers operational precautions, certification periods and the need for these systems to meet rigorous standards for reliability, toxicity, and resistance to heat, vibration and corrosion.

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Source: MCA.

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