The Helios RP-IW is a 90-degree inner angle fitting featuring a compact cube shape and a smooth, square profile designed for easy installation in corners on ceilings and walls. Manufactured from closed-cell, high-density, thermally insulated EPS material, it provides excellent insulation and durability. The smooth inner surface prevents dirt build-up, while integrated cutouts and surface adjustments allow for seamless, gap-free fitting even on uneven surfaces. This fitting supports duct sizes of DN 100 and is suitable for volume flows up to 140 m³/h. It can be painted, plastered, or wallpapered to match room design aesthetics. Supplied in cartons of two pieces.