DMI Companies provide superior HVAC products to contractors and builders worldwide. Whether you need something as small as a ... sheet metal screw, or as large as 60" ductwork, we've got you covered. Our products are known for their high quality, and we take pride in our manufacturing processes. All four divisions of DMI Companies produce Union Made products. Ductmate Industries, Aire Technologies, GSI, and Linx Industries are all divisions of DMI Companies. read more