BESA warns of critical fire safety issue in ventilation systems

BESA warns of critical fire safety issue in ventilation systems

The Building Engineering Services Association (BESA) has issued a critical fire safety warning about a potential fire safety weakness in a large number of building ventilation systems.

The fire damper safety issue has been deemed as critical by BESA, who issued an interim technical bulletin (VH001) ahead of a full update of its industry guidance for the “Installation of Fire Dampers and Smoke Dampers” (DW145) which is due for launch at the Association’s National Conference later this year.

BESA’s technical committee sanctioned the technical bulletin, to give contractors the information and appropriate terminology to alert clients to the problem.

BESA has also said it will take the unusual step of producing an interim announcement because of the urgent nature of the problem after annual inspections, These inspections carried out by maintenance contractors found that “a huge number of dampers” had been incorrectly installed.

Graeme Fox, Head of Technical at BESA, explained that many did not comply with manufacturers’ instructions and needed remedial action urgently. He said: “We have been alerted to the very dangerous practice of using self-drilling “tek” screws which do not melt when temperatures rise during a building fire. This means spring-loaded dampers will not be released to contain the spread of fire within the zone and ensure the integrity of the fire-stopping measure.

“Dampers must be secured by fusible fixings that allow the duct to break away otherwise the collapsing duct could pull the damper out of place and break the seal between the fire zones.”

The bulletin also updated members on the guidance and statutory requirements covering installation, testing and maintenance of fire dampers and smoke dampers. The bulletin also highlights the legal obligations to ensure fire safety systems remain fit for purpose in line with the Regulatory Reform (Fire Safety) Order 2005 for England and Wales and the Fire Safety (Scotland) Regulations 2006.

It outlines the crucial role played by the penetration seal in ensuring the overall fire-stopping integrity of an installation, the importance of maintenance teams being able to find and access dampers for testing and repair, and the need for designers and installers to seek expert advice from damper manufacturers.