The Helios Fans WSG 400 is a wall grille designed for covering intake and exhaust air openings, effectively shielding against rain, snow, and animal entry. Suitable for both rectangular and round duct connections, it provides flexibility across various installation types. The grille features a robust construction made from extruded aluminium profiles with a natural anodised finish for long-lasting durability and corrosion resistance. Fixed louvres are spaced at 65 mm intervals to maintain efficient airflow, while a rear-mounted mesh grill made of galvanised sheet steel with a 16 mm mesh width offers additional protection without compromising ventilation efficiency.