This specification contains the initial, start of life dimensional, mechanical and environmental performance requirements which a fully installed blown fibre protected, non-sealed closure for duct and microduct cable, must meet in order for it to be categorised as an EN standard product. These products are suitable for installation of and use with microduct fibre units, microduct optical fibre cables, microduct and protected microduct as defined within EN 60794-5. When the non-sealed closures are installed in subterranean environments it is mandatory to use sealed ABF connectors meeting EN 50411-2-8 in order to guarantee the expected network performance and reliability.