Knut Bø VGS 6 is a 6 inch through-wall duct termination fitted with an external storm cap and protective grille, sized for wall thicknesses up to 30 cm. The assembly caps the outdoor end of a ventilation or exhaust duct and prevents wind-driven rain and vermin ingress while maintaining airflow. Typical applications include kitchen exhaust and general room ventilation outlets in residential and light-commercial walls. Supplied in packs of 6 pieces.