Helios Fans VDD 400/4 Ex

The Helios VDD 400/4 Ex is a centrifugal roof fan designed for vertical air discharge in hazardous environments, fully compliant with ATEX explosion-proof regulations. Its casing is made from seawater-resistant aluminium and features integrated anti-intrusion protection for enhanced operational safety.

The motor support plate and base plate are constructed from galvanized steel, with an aluminium inlet nozzle to ensure corrosion resistance. The base plate includes a threaded screw for secure accessory mounting on the intake side, following the DIN 24155 hole pattern (sheet 3). A protective grille on the discharge side is supplied as standard, conforming to DIN EN ISO 13857 safety standards.

This model incorporates a high-efficiency backward-curved centrifugal impeller made of aluminium, dynamically balanced in accordance with DIN ISO 1940 – 1 to ensure smooth, vibration-free performance.

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