The Helios Fans KWL 60 DR‑B is a 100 mm deep external stainless steel frame with an integrated separator, designed for ventilation systems installed in walls with thicknesses between 249 and 349 mm. It features a durable protective coating, making it ideal for use in environments with high levels of air pollution or elevated salt content, such as coastal regions. This frame provides a secure and corrosion-resistant exterior solution for long-lasting performance in harsh environmental conditions.