Vigilance is key to freeze prevention
Red-painted fire-suppression pipes are shown near an opened vertical roll-up door in Bldg. 3001 on Nov. 17, 2017, Tinker Air Force Base, Oklahoma. Areas like this have a higher potential for proximity freezing if not monitored closely and doors aren't closed to keep the heat in during below-freezing periods. (U.S. Air Force photo/Greg L. Davis)