PATIKIL Ducting Reducer 180mm to 150mm, 7 to 6 Inch Metal Air Ducting Connect Round Duct Pipe or Extractor Fans Reducer HVAC Dryer Vent Chimney : Amazon.co.uk: DIY & Tools
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Straight Duct Reducer Ventilation Reduction for Air Extractor (100mm to 150mm)
Howden Lamona Extractor Fan Outlet Reducer 082645788
125 Round Ducting Reducer 125-100mm | Toolstation
Oneyijun 100-200mm ABS Ducting Reducer Round Pipe Multi Reducer Extractor Fan Ventilation Systems Hose Connector Adapter Diameter White Tube Reducing Ring Duct with Stainless Steel Clamp and Tape : Amazon.co.uk: DIY &