The Helios Fans RVBD 180/160 is a precision-engineered reducing spigot used to transition between DN 180 and DN 160 duct sizes. Equipped with external seals on both ends, it ensures a tight, leak-free connection within the ventilation system. Ideal for adapting ductwork in residential or commercial installations, the RVBD 180/160 supports efficient airflow management while maintaining system integrity. Constructed from durable materials, it offers long-lasting performance and easy integration into existing systems.