Helios Fans KRW 355÷4÷60÷35

The Helios KRW 355÷4÷60÷35 is a centrifugal fan intended for direct integration into rectangular ductwork. Its compact, space-saving housing is built from galvanized sheet steel and equipped with standardized flange profiles on both ends, ensuring secure and straightforward installation. The motor and impeller unit can be swung out for easy servicing and inspection.

This fan features a high-performance radial impeller with backward curved blades constructed from plastic and galvanized steel. It operates with minimal vibration due to precise dynamic balancing to quality level G 6.3 in accordance with DIN ISO 1940 T.1.

The drive system consists of a maintenance-free single-phase AC external rotor motor with a closed construction. It includes thermal contacts connected in series with the winding for automatic reset protection. The motor windings are impregnated for moisture resistance, and speed control is possible either through a 5‑step transformer or via continuous electronic regulation. Sealed, long-life ball bearings ensure quiet operation, and the unit is supplied with a pre-wired terminal box rated to IP44.