Helios Fans VDD 450/4

The Helios VDD 450/4 is a centrifugal roof fan designed for vertical discharge, featuring an aerodynamically optimized casing made from seawater-resistant aluminium with integrated protective guards. The motor support and base plate, along with the inlet cone, are constructed from galvanized steel. The base plate includes threaded bolts for easy attachment of intake air accessories, following the DIN 24155 hole pattern (page 3). A bird guard is fitted on the outlet side as standard, complying with DIN EN ISO 13857 safety requirements.

This fan uses a high-efficiency backward-curved centrifugal impeller made from durable polymer materials. The impeller is dynamically balanced in accordance with DIN ISO 1940 – 1 standards to ensure smooth, vibration-free performance.

The unit is powered by a speed-controllable, totally enclosed three-phase external rotor motor with IP 54 protection. It is equipped with ball bearings featuring impregnated windings for maintenance-free operation and includes radio interference suppression to guarantee reliable and efficient ventilation.