Ducting

110mm x 54mm Short Rectangular to 100mm Female Round Adaptor

100mm Round Threaded Hose Connector Male - Connect Flexi Duct To Rigid

110mm x 54mm Rigid Ducting End Cap

110mm x 54mm Flat Rectangular Ducting Horizontal 45 Degree Bend

110mm x 54mm Straight Connector with Damper

I-sells Metal Ducting Male Sleeve Connector 100mm / 4 inch Rubber Seal Coupling

110mm x 54mm Flat to 4" 100mm Round adaptor/Plenum

I-sells Metal Ducting End Cap 100mm / 4 inch Male / Female

100mm Round Threaded Connector Female