Sheet Metal duct fabrication has seen great improvements over the years as Plasma Cutters and Coil Lines have become more prominent. Phenolic duct fabrication has brought great advancements to the market as well. CNC machines specifically designed to handle the phenolic duct thicknesses and fabrication methods are available from GoMech. These CNC machines can handle both fittings and straight duct. Other specialized machines and tools are available for Phenolic duct as well from these manufacturers.