The Helios Fans ZRL 100 is a complete wall duct system consisting of a DN 100 telescopic tube adjustable from 260 to 500 mm, paired with a soffit channel made from fire-retardant EPP (fire protection class B1). Supplied with two plaster covers for internal and external openings, it ensures protection from debris during the construction phase. The system allows for flexible installation to the left or right of windows without modification. For compliance and performance, the soffit element must be fully overinsulated and is not suitable for wall sections with insulation thicknesses of 100 mm or less.