Helios Fans SKRW 400÷4÷70÷40

The Helios SKRW 400÷4÷70÷40 is a rectangular centrifugal fan designed for direct installation within rectangular duct systems, featuring a noise-reduced design for quiet operation. The compact casing is made from galvanised steel, flanged on both ends, and acoustically lined with a 50 mm thick mineral fibreboard to minimize noise. The fan’s swing-out motor and impeller unit enable easy access for cleaning and maintenance.

It uses a centrifugal, backward curved impeller made of durable polymer, dynamically balanced according to DIN ISO 1940 Pt.1 to ensure smooth, low-noise running.

The motor is a totally enclosed, maintenance-free, single phase external rotor type with built-in thermal contact connected to a tripping unit for protection. Speed control can be managed via a 5‑step speed transformer controller or an electronic stepless controller. The motor winding is moisture-protected and features low-noise ball bearings with long-term lubrication. The terminal box is fitted to a flying lead for flexible wiring.