STBF (Pendant 360°) Upper-Air series units are designed to be suspended in occupied spaces at a minimum height of 7 1/2 feet off of the floor. STBF series fixtures provide 600-800 square feet of coverage, or 1,000-1,400 square feet per fixture, depending upon the model you choose. STBF units utilize a fan to aid with air mixing and are designed to operate on a 120 or 220-volt electrical feed, allowing installation flexibility. Multiple fixtures can be used to cover larger areas.