Helios KRW 225/2/40/20

Centrifugal fan with backward-curved blades, designed for direct installation in rectangular duct systems. The fan unit can be folded out for easy maintenance. The housing is made of galvanized steel sheet with standardized flange profiles on both sides, offering a space-saving design and easy maintenance thanks to the pivoting motor/impeller unit. It features a powerful radial impeller with backward-curved blades made of plastic and galvanized steel. The fan operates without vibrations, thanks to dynamic balancing according to quality grade G 6.3 DIN ISO 1940 T.1.

The drive consists of a maintenance-free single-phase AC external rotor motor with a closed design. It has integrated thermal contacts wired in series with the winding (self-resetting), and the speed can be adjusted via a 5-stage transformer or electronically (continuously). The winding is impregnated and sealed for moisture protection, with low-noise ball bearings that provide long-term lubrication. The power connection is made via a pre-assembled connection box (IP44).