The Helios Fans WSG 355 is a wall grille designed to cover intake and exhaust air openings, effectively preventing the entry of rain, snow, and animals. Suitable for both rectangular and round duct connections, it offers flexible application in various ventilation systems. The grille is constructed from robust extruded aluminium with a natural anodised finish, ensuring long-term durability and resistance to corrosion. Fixed louvres are spaced 65 mm apart to direct airflow efficiently. Behind the louvres, a mesh grille made of galvanised sheet steel with a 16 mm mesh width adds extra protection while maintaining optimal ventilation performance.