Equipment Company, Inc. Indianapolis, Indiana 46202. JTD Spiral, Inc. Spiral Pipe, Fittings, Rectangular Ductwork, Fittings Single and Dual Wall. Security Grilles, Bar Grilles, Access Doors. Fans, Exhausters and Ventilators, Energy Recovery Units, Roof Cures. Acoustical Plenums / Housings, Equipmen...