The Soler and Palau MCA-6000 non-return flaps are designed to allow airflow in one direction while preventing reverse airflow in ducted ventilation systems. These flaps protect against backdrafts, maintain system efficiency, and help prevent the entry of unwanted air or contaminants into the ducts. Suitable for residential, commercial, and light industrial applications, the MCA-6000 is built for durability and easy installation, providing reliable performance and contributing to improved indoor air quality and ventilation system efficiency.