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Prysmian's Enhanced Performance Fibre Unit (EPFU) bundle fibre designed for blowing in ducts with an internal diameter of 3.5mm. Smaller fibre counts manufactured with a rough exterior coating to aid the performance of blowing, allowing air capture on the surface of the fibre unit. Specifically engineered for blown fibre applications. The optical fibres are initially encapsulated in a soft inner acrylate layer which cushions the fibres followed by an outer harder layer, protecting the fibres from external damage. Finally there is a low-friction layer that helps to maximise blowing distance (typically in excess of 1000 metres).