102mm x 10m Round Insulated Flexible Aluminium Hose - Verplas
Bathroom extractor fan - BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST
Plastic 5 inch 125mm Ducting Pipe Ventilation Extractor Fan Bath Kitchen Toilet | eBay
Professional exhaust hose with aluminium insulation, diameter 125 mm / 127 mm, length 5 m, for dryers, air conditioning, extractor, tumble dryer, stable and heat-insulated (standard). : Amazon.co.uk: Large Appliances
Thermoduct roof terminal Ø250mm
Air Duct Noise Silencer for Ventilation Systems | Alnor
Duct & Duct Fittings - Fantech Trade
Ducting For MVHR And MEV Systems
Insulation is ventilation
Hon&Guan 4 Inch Low Noise Flexible Ventilation Ducting - Thermal and Acoustic Insulation Aluminum Air Duct for Air Conditioner, Extractor Fan Length 1.2 m (ø105-110 mm) : Amazon.co.uk: DIY & Tools