Reducer is a component fitting of Circular pipe system. Actual appearance/scale of product may vary dependant on size. Connection of various sized duct. Cut out spare length piece to get the required size.
1m of White 110 x 54mm Flat Channel Rectangular Ducting Tube - CHEAPER FOR QTY
4" 5" 6" Plastic Duct Round Solid Ducting Tube Pipe Ventilation Extractor Fan
Metal Inline Extractor Fan 325mm / 12.8" Industrial Ducting Tube Ventilator
4" 100mm Plastic Round Kitchen Ducting Ventilation Duct Pipe Tube Extractor Fan
5" 125mm Plastic Solid Duct Round Ducting Pipe Ventilation Tube Extractor Fan
6" 150mm Plastic Round Kitchen Ducting Ventilation Duct Pipe Tube Extractor Fan