Viessmann 7831028 Radial Fan W/O Electronics RLS154 is a replacement airflow component designed to support efficient air circulation in compatible heating equipment. It works by using a rotating radial fan wheel to draw and move air through the heating system, supporting proper combustion or ventilation airflow as required by the equipment. Designed for use with compatible Viessmann b... https://www.partshnc.com/7831028-viessmann-radial-fan-rls154-wo-electr