Helios Fans SKRW 355÷4÷60÷35

The Helios SKRW 355÷4÷60÷35 is a rectangular centrifugal fan designed for direct installation in rectangular duct systems, featuring a noise-reduced design. The compact casing is constructed from galvanised steel, flanged at both ends, and acoustically lined with 50 mm thick mineral fibreboard for effective sound insulation. The fan is service-friendly with a swing-out motor and impeller unit for easy cleaning and maintenance.

The centrifugal impeller is backward curved and made from durable polymer, dynamically balanced according to DIN ISO 1940 Pt.1, ensuring low noise operation.

The fan is powered by a totally enclosed, maintenance-free, single phase external rotor motor. The motor includes built-in thermal contacts connected to a tripping unit for protection. Speed control is available through a 5‑step speed transformer controller or an electronic stepless controller. The motor winding has moisture protection, and the low noise ball bearings feature long-term lubrication. The terminal box is mounted on a flying lead for flexible connection.