The Helios Fans KWL 45 – 160 SE is a sound insulation component that enhances insertion loss and lowers the sound power level of ventilation systems. It is designed for installation inside wall sleeves, with a maximum of four units spaced at 500 mm intervals. Constructed from duroplastic foam based on melamine resin, this element complies with fire protection class B1 standards. Its dimensions correspond to DN160 with a height of 50 mm, offering effective acoustic insulation for ventilation applications.