Helios Fans VDW 250/4

The Helios VDW 250/4 is a centrifugal roof fan engineered for vertical discharge, delivering efficient and reliable ventilation in various applications. The casing is made from seawater-resistant aluminium for enhanced durability, with an integrated protection guard to ensure safety. The motor support and base plate are manufactured from galvanised steel, featuring a precision-formed inlet cone to optimise airflow. The base plate includes threaded bolts for easy attachment of intake accessories and conforms to DIN 24155 (page 3) specifications. A bird guard is fitted as standard on the outlet, meeting DIN EN ISO 13857 safety standards.

The fan features a high-efficiency, backward curved centrifugal impeller made from galvanised sheet steel, dynamically balanced in accordance with DIN ISO 1940 – 1 for smooth and quiet operation.

Driven by a totally enclosed, speed-controllable single-phase external rotor motor with IP44 protection, the unit is ball bearing mounted with impregnated windings for improved resistance to moisture and extended motor life. This maintenance-free and interference-free fan is ideal for effective roof-mounted ventilation in both residential and commercial settings.