The Soler and Palau MCA-350 non-return flaps are designed for 350mm ducting systems to prevent reverse airflow. They allow air to flow freely in the intended direction while blocking unwanted backflow, helping maintain energy efficiency and protecting the ventilation system. Constructed from durable materials, these flaps provide long-lasting performance and are suitable for commercial, industrial, and residential ventilation applications. Easy to install, the MCA-350 ensures controlled airflow and enhances overall system reliability.