Helios Fans VDD 500/4 Ex

The Helios VDD 500/4 Ex is a centrifugal roof fan engineered for vertical discharge in ATEX-classified hazardous environments. Designed with efficiency and safety in mind, it features a seawater-resistant aluminium casing equipped with integrated anti-intrusion protection.

The motor support and base plates are made of galvanized steel, while the inlet nozzle is constructed from aluminium to ensure corrosion resistance. The base plate is designed with a threaded screw for easy attachment of intake-side accessories, conforming to the DIN 24155 hole pattern (sheet 3). A protective grille on the discharge side is included as standard, compliant with DIN EN ISO 13857 safety standards.

This fan incorporates a high-efficiency, backward-curved centrifugal impeller made from aluminium and is dynamically balanced according to DIN ISO 1940 – 1 for smooth, low-vibration operation.

Power is supplied by a totally enclosed, speed-controllable three-phase external rotor motor with IP 44 protection. The motor is equipped with moisture-protected ball bearings, offering maintenance-free and interference-free operation. The explosion-proof construction makes the VDD 500/4 Ex ideal for safe and reliable ventilation in potentially explosive or flammable atmospheres.