The Helios LF 355 air filter is designed for wall and ceiling installations to effectively cover internal duct and ventilation openings. It features a robust frame made from high-quality, light grey polymer with an integrated egg crate grille to ensure uniform airflow. The included filter mat is made from thermally bonded synthetic fibres, classified as ISO Coarse 30% (G2), and is fire-resistant according to DIN 53438 F1. Its large cross-sectional design supports full air passage, minimizing pressure loss and enhancing dust collection. With a dust storage capacity of 380 g/m², the LF 355 is ideal for maintaining clean air in both residential and commercial ventilation systems.