Fantronix Round Ducting Reducer 200mm to 150mm - 8 to 6 inch Duct Pipe Reduction Connector for Extractor Fans, Cooker Hood and Ventilation Units : Amazon.co.uk: DIY & Tools
General Purpose 200mm Cable Duct 6Mtr Black 30056
Rectangular Channel 200mm x 55mm Transformer to 125mm Round Duct Pipe / Hose
Express Duct Straight Duct 200mm Diameter X 1000mm Long
Anti-Static Flexible PU Ducting 200mm Diameter 10 Meter Length PROTAPE PUR 333 AS (333-0200-0007)