Helios Fans SKRD 500÷4÷80÷50

The Helios SKRD 500÷4÷80÷50 is a noise-reduced rectangular centrifugal fan designed for direct integration into rectangular duct systems. Its compact casing is made from galvanised steel with flanged ends and is acoustically lined with 50 mm thick mineral fibreboard to ensure quiet operation. Maintenance is simplified with a swing-out motor and impeller unit that allows easy access for cleaning and servicing.

Equipped with a highly efficient centrifugal impeller featuring backward curved blades made from impact-resistant polymers and galvanised steel, the impeller is dynamically balanced to Class G 6.3 in accordance with VDI 2060 and ISO 1940 standards.

The fan is driven by a totally enclosed 3‑phase external rotor motor with thermal contacts connected to the terminal box. Speed control options include a 5‑step transformer controller, an electronic stepless controller, or a Helios frequency inverter with sinus filter on all poles. The motor incorporates maintenance-free, low-noise sealed-for-life ball bearings and tropical protection for the windings. Power supply is managed through a pre-assembled IP55-rated terminal box.