Helios Fans VDD 315/4 Ex

The Helios VDD 315/4 Ex is a centrifugal roof fan designed for vertical discharge in hazardous environments, certified to meet ATEX explosion-proof standards. The fan casing is constructed from seawater-resistant aluminium and includes integrated anti-intrusion protection for enhanced safety.

The motor support plate and base plate are made of galvanized steel, with an aluminium inlet nozzle for corrosion resistance. The base plate is equipped with a threaded screw for secure accessory mounting on the intake side, following the DIN 24155 hole pattern (sheet 3). A protective grille is installed on the discharge side as standard, complying with DIN EN ISO 13857 safety requirements.

This model features a high-efficiency backward-curved centrifugal impeller made from aluminium, dynamically balanced to DIN ISO 1940 – 1 standards to ensure vibration-free and reliable performance.

Power is provided by a totally enclosed, speed-controllable three-phase external rotor motor rated IP 44. The motor is mounted on ball bearings with moisture protection, designed for maintenance-free and interference-free operation. The explosion-proof design makes this fan ideal for industrial ventilation in ATEX-regulated hazardous areas.