HELIOS Centrifugal Circular Duct Fan is designed for direct installation in duct systems, suitable for small and medium air volumes against high resistance. It is ideal for residential, commercial, and light industrial ventilation applications requiring compact and efficient airflow.

The casing is made of durable galvanized sheet steel with standard duct spigots for easy installation. It features a backward-curved centrifugal impeller made of polymer, ensuring efficient, low-noise performance. The impeller is directly mounted and dynamically balanced for smooth operation. It uses a totally enclosed single-phase external rotor motor with thermal protection, maintenance-free bearings, and supports speed control via voltage reduction for flexible airflow adjustment.