The Helios Fans WSG 250 is a protective wall grille designed for intake and exhaust air openings, preventing the ingress of rain, snow, and animals. Compatible with both rectangular and circular duct entries, it offers flexible installation for various ventilation systems. The grille is constructed from sturdy, natural anodised extruded aluminium for durability and corrosion resistance. Fixed louvres are spaced at 65 mm intervals to guide airflow, while a rear-mounted mesh grill made from galvanised sheet steel with a 16 mm mesh width ensures additional protection without compromising ventilation performance.