Sioux Steel Company, established in 1918, is a manufacturer of commercial bins and farm grain storage systems, Pro-Tec engineered buildings and livestock. Its product line include axial and centrifugal aeration fans, flat storage buildings, and bolted, corrugated and hopper steel storage. The company also manufactures secondary containment shelters and drying bins. It performs stress test on its roof trusses and offset purlin placement to ensure stability under pressure. The company s commercial bin roof system incorporates three roof panels per sidewall sheet. Its commercial roof is engineered to support more than 10,000 pounds at center collar. The company also offers a range of accessories for steel commercial bin, such as legs, conveyors, catwalks, cage and ladder systems, custom floor designs and aeration fans. Sioux Steel Company is located in Sioux Falls, S.D.