Helios Fans VDD 450/4 Ex

The Helios VDD 450/4 Ex is a centrifugal roof fan designed for vertical air discharge in hazardous environments, fully compliant with ATEX explosion-proof standards. The casing is made from seawater-resistant aluminium and includes integrated anti-intrusion protection for added security.

The motor support plate and base plate are constructed from galvanized steel, complemented by an aluminium inlet nozzle to resist corrosion. The base plate is fitted with a threaded screw for secure accessory attachment on the intake side, following the DIN 24155 hole pattern (sheet 3). A protective grille on the discharge side is provided as standard, meeting DIN EN ISO 13857 safety requirements.

This fan features a high-efficiency backward-curved centrifugal impeller manufactured from aluminium, dynamically balanced in line with DIN ISO 1940 – 1 to ensure smooth and vibration-free operation.

It is powered by a totally enclosed, speed-controllable three-phase external rotor motor with IP 44 protection. The motor employs ball bearings with moisture protection, offering maintenance-free and interference-free performance. This explosion-proof fan is ideal for industrial ventilation in ATEX-classified hazardous zones.