The Helios Fans WES 90/100 wall kit is designed for the through-wall installation of 90 mm and 100 mm fans. It includes two interlocking plastic tubes that form a telescopic wall sleeve, suitable for flush-mounted setups in walls ranging from 260 mm to 500 mm in thickness. The exterior wall finish is available with a frame featuring either three self-closing louvres or a fixed grille insert. All components are made from durable plastic and are included in the package, offering a complete and reliable installation solution.