The Helios Fans WSG 500 is a durable wall grille designed to protect intake and exhaust air openings on walls from rain, snow, and animals. It is suitable for both rectangular and round duct connections, providing versatile installation options. Constructed from extruded aluminium with a natural anodised finish, the grille offers excellent strength and corrosion resistance. Fixed louvres spaced 65 mm apart guide airflow effectively, while a galvanised sheet steel mesh grille with a 16 mm mesh width is placed behind the louvres to provide additional protection without obstructing ventilation.