The Helios Fans WSG 450 is a protective wall grille designed to cover air intake and exhaust openings, preventing the ingress of rain, snow, and animals. Compatible with both rectangular and round duct entries, it suits various ventilation system configurations. Constructed from durable extruded aluminium with a natural anodised finish, the grille offers excellent corrosion resistance and long-term reliability. Fixed louvres spaced at 65 mm intervals allow for efficient airflow control, while a galvanised sheet steel mesh grille with a 16 mm mesh width is installed behind the louvres to provide additional protection without limiting ventilation performance.