Twenty models in both 12-ft-tall and 22-ft-tall varieties are available. Each unit measures approximately 12 ft wide by 22 ft 9 in. long and can be installed in multi-unit arrangements. Standard construction consists of G-235 (Z 725 metric) galvanized steel with Type 304 or 316 stainless steel for the cold-water or hot-water basins or the entire tower.