Profile: Shade Tree Mfg. is a producer of HVAC sheet metal products. We specialize in rectangular, fiberglass and spiral ductwork systems. We also provide services in plasma cutting and custom bending. Our products are used in a wide range of industrial applications. Our products are available in a wide range of sizes and shapes. Our rectangular duct and fitting sections are made standard with flanged connection for attachment to other ducts or fittings. Our rectangular duct and fittings are fabricated from hot-dipped galvanized steel in gauges.