Our fittings are produced in accordance with DW144, and have a rolled edge for safer handling and improved alignment. Our range of segmented spiral duct bends start at 224mm dia upwards. All spiral duct bends are half radius e.g. 100mm Bend = 50mm throat radius. All spiral duct... Metal Ducting 45 Degree Pressed Bend Pressed metal ducting bend with male connections, which will fit inside female fittings such as spiral ducting. Galvanized Sheet Spiral 45 Degree Duct Bend for Spiral Pipe with or Without Rubber China Manufacturer - Pressed Bend and Rubber Gasket 4 Inch Galvanized Duct Elbow 45 Degree QF Segmented Bend R=1,5 Metal Ducting Bend Metal Ducting 45 Degree Bend., 100mm / 4 inch. 100mm Round Ducting 45 Degree Bend | Naples UK 100mm Bend = 50mm throat radius. If your application requires two bends to be joined, a female coupler will be required.