... Joints easier to seal Oval Tube forming machine(tube making machine)Main advantages of oval tubeBetter air ... .2mmMax. Tube Length3100mmEasier to install330~1500mmSize of flat oval150/400mm~500/1550mmMotor Power22kW, 380V, 3 ... machine,riveting machine,Pittsburgh seam lock machine.Hydraulic section steel bending machine,metal sheet flange forming machine,TDF hydraulic folder,auto cutting to length line ...