The Helios Fans KWL 60 RS‑B is a complete installation set for decentralized ventilation systems, designed for use in demanding environments with high air pollution or salt-laden air, such as coastal regions. It includes a 349 mm long wall sleeve, two building protection covers, and an outer façade with deflector plate — all made from stainless steel and finished with a protective coating. This robust set ensures secure wall integration, construction-phase protection, and long-lasting resistance to environmental stress.