The Helios Fans WSG 30/15 is a wall grille engineered to cover intake and exhaust air openings, effectively blocking rain, snow, and animals from entering the duct system. Designed to match the dimensions of Helios duct fans, it fits securely into the cross-section of the ductwork. The grille is constructed from natural anodised extruded aluminium, offering strength and corrosion resistance. Fixed louvres are spaced at 65 mm intervals to guide airflow efficiently. Behind the louvres is a mesh grill made from galvanised sheet steel with a 16 mm mesh width, providing additional protection without impeding ventilation.