Rectangular pipe making line 3 , Air condition auto . ABOUT US Ma’ Prima CNC is , we manufacture high quality air duct line II, III, IV, V , U Shape, electric shear , folding machine, TDF bender , duct zipper, spiral former machine , cnc plasma cutter, elbow maker, TDF Flange machine, elbow making machine, Lock …Air Distribution Products Rectangular Duct 9 3 2 4 1 HR Series is protected by intellectual and industrial property rights . right to alterations reserved Liner Specifications All HR-Series are available with the different liner type, fastened to the duct according to SMACNA HVAC Duct Construction standards 2005Duct Up Industries has been installing ductwork for over 20 years, and Clarkin Sheet Metal Pty has been manufacturing ductwork for over 8 years. We started Clarkin Sheet Metal in 2011 toplement the Install team and to give the Mechanical Contractor the option of having a Supply and Install package from one Supplier.Along with rounded piping, we also offer oval piping which can be used in place of rectangular wall stack duct and i stud space. Ensuring your home has proper ventilation is essential to preventing moisture from damaging wood or metal or enabling the growth of mold.