Helios Fans VDD EC 355

The Helios VDD EC 355 is a vertical discharge roof fan designed with an efficiency-optimized housing made from seawater-resistant aluminium, including an integrated protection guard to ensure robust performance and safety. The motor support and base plate are constructed from galvanised steel and fitted with an inlet cone. Threaded bolts on the base plate allow for the secure attachment of intake air accessories, following the DIN 24155 hole pattern (page 3). A bird guard conforming to DIN EN ISO 13857 standards is fitted on the outlet side as standard.

Equipped with a high-efficiency backward curved centrifugal impeller manufactured from durable polymers, the fan is dynamically balanced according to DIN ISO 1940 – 1 for quiet and smooth operation.

This model is powered by an energy-efficient, speed-controllable electronically commutated (EC) external rotor motor with an enclosed IP54 protection rating. The motor features ball bearings insulated against moisture, ensuring maintenance-free and interference-free operation.

Integrated electronic temperature monitoring protects both the EC motor and its electronic components. The fan comes standard with an external terminal box and isolating switch rated to IP65 protection. An internal potentiometer allows precise adjustment of the fan speed between minimum and maximum levels. Users can also benefit from continuously variable speed control via the potentiometer or a universal control system, providing flexible and energy-efficient ventilation solutions.