Although by far the largest, the main process building (K-300) was but one of many that made up the facility. There was a conditioning building (K-1401), where piping and equipment were cleaned prior to installation. A feed purification building (K-101), was built to remove impurities from the uranium hexafluoride, but never operated as such because the suppliers provided feed good enough to be fed into the gaseous diffusion process. The three-story surge and waste removal building (K-601) processed the "tail" stream of depleted uranium hexafluoride. The air conditioning building (K-1401) provided per minute of clean, dry air. K-1201 compressed the air. The nitrogen plant (K-1408) provided gas for use as a pump sealant and to protect equipment from moist air.