What is the minimum and maximum gap size for FAS Fire Door Foam™?

FAS Fire Door Foam™ can be installed in perimeter gaps ranging from a minimum practical width of 5mm to a maximum tested gap of 33mm. The fire-rated foam is designed for sealing gaps around fire door frames as part of a tested fire-stopping system. For guidance on permitted gap sizes for specific fire door assemblies and fire resistance requirements, please refer to the FAS Fire Door Foam™ Installation Guide.