Ducting

125mm to 100mm (5" to 4") White Plastic Ducting Reducer

Kair Rectangular Straight Connector 100mm x 54mm Flat Pipe Joint

100mm Round Flexible/Rigid Ducting Straight Connector

Kair Threaded Connector 100mm - 4 inch for Joining Flexible Hose to Round Duct Pipe

100mm to 80mm Round Hose End Rigid/Flexible Ducting

Kair Threaded Connector 100mm - 4 inch for Joining Flexible Hose to Round Ducting Fittings

Kair Ducting Adaptor 110mm x 54mm to 100mm - 4 inch Rectangular to Round Straight Channel Connector - Female

National Ventilation 494 Easipipe Straight Pipe Connector with Back Draught Damper 100mm / 4 Inch white