Thermoplastic duct component has twin extruded walls - smooth inner wall and outer corrugated one

摘要

The duct component (1) has a U-shaped cross-section with vertical side walls having upper edges shaped to receive a grid. The extruded side walls are double, comprising a smooth inner rigid wall (2) and an outer wall (4) with corrugations or ribs running vertically on the sides of the duct and shaped to form a sole (5) beneath it with reinforcing ribs (16) and spacers (17) at the sides.