The Helios Fans WSG 50/25 is a wall grille designed to cover intake and exhaust air openings, preventing the entry of rain, snow, and animals. It is dimensioned to fit Helios duct fans and can be inserted into the cross-sectional area of the ductwork. The grille is constructed from extruded aluminium with a natural anodised finish, providing strength and corrosion resistance. Fixed louvres spaced 65 mm apart allow effective airflow while a protective mesh grill made from galvanised sheet steel with a 16 mm mesh width is positioned behind the louvres to enhance durability and screening without impeding ventilation.