6212 Highview Drive - Fort Wayne, IN 46818 P.O. BOX - 8007 - Fort Wayne, IN 46898-8007 Phone:(260)497-1300 - Fax:(260)489-7326 JTD Spiral, INC. fabricates and delivers Spiral Duct, Oval Duct, and Dual Wall duct in both Round and Oval, and fittings for all. We can form Spiral pipe from the following ...