Internal fit wall kit is designed to simplify installation by allowing the user to fully fit inside the building, avoiding the need for scaffolding and significantly reducing the cost and complexity associated with working from heights. Includes backdraft shutter. Vent Colour: Brown Vent Width: 100mm Channel Width: 117mm Hose Length: 225-390mm Model No: DHRIWKBBS 2 Year Guarantee Ideal for High-Rise Applications Suitable for 100mm Fans Extendable Length Reduces Water Ingress Vent Colour: Brown Vent Width: 100mm Channel Width: 117mm Hose Length: 225-390mm Model No: DHRIWKBBS 2 Year Guarantee Ideal for High-Rise Applications Suitable for 100mm Fans Extendable Length Reduces Water Ingress