Spiral Pipe Mfg Co., Inc. offers a complete line of metal air ducts and supplies for commercial and industrial applications. We manufacture lockseam, high pressure spiral pipe, and fittings at our plant in Minneapolis, Minnesota and ship products throughout the country. Spiral is made from light-gauge metal and designed for maximum strength, making it ideal for above and below ground installation. It is well suited for all types of ventilation including grain handling, dust removal, carbon monoxide exhaust and dual wall pipe for thermal and sound insulation. We offer a complete line of metal air ducts for commercial and industrial spiral pipe and fittings, custom duct and duct fittings for HVAC and dust collecting systems, along with a comprehensive line of chemical and underground duct.