The Helios GB-WSG 250 is designed to cover air intake and outlet openings on walls, effectively preventing the intrusion of rain, snow, and animals. It is suitable for both rectangular and round pipe entries. The grille features a sturdy construction made from extruded aluminium profiles with a natural anodised finish for durability. Fixed louvres spaced 65 mm apart provide protection, while a galvanised sheet steel mesh grille with 16 mm mesh width is positioned behind to ensure additional security and airflow integrity.