Helios Fans VDW 355/4

The Helios VDW 355/4 is a centrifugal roof fan engineered for vertical discharge applications, delivering reliable and efficient ventilation performance. Constructed with a corrosion-resistant aluminium casing, the unit includes an integrated protection guard for long-lasting durability in outdoor conditions. The galvanised steel motor support and base plate feature a shaped inlet cone to optimise airflow. The base plate is equipped with threaded bolts to facilitate secure installation of intake accessories, following the DIN 24155, page 3 standard. A bird guard compliant with DIN EN ISO 13857 is installed at the outlet for added safety.

At the heart of the fan is a high-efficiency backward curved centrifugal impeller made from durable polymers, dynamically balanced to DIN ISO 1940 – 1 to ensure smooth and quiet operation.

The fan is powered by a totally enclosed, single-phase external rotor motor with IP54 protection. The motor features ball bearings with impregnated windings for enhanced moisture resistance and reliability. It is speed-controllable, maintenance-free, and radio suppressed, making the VDW 355/4 a versatile choice for commercial and residential roof-mounted ventilation systems.