Officer Training School Instructor Capt. Jeremy Karr walks by a temporarily installed portable air-handling unit in a hallway at the school, May 13, 2020, Maxwell Air Force Base, Alabama. Permanent units are being affixed to the HVAC systems in the school’s eight buildings. The air-handling technology, along with the current use of HEPA filters, show promise in decreasing airborne spread of bacterial and viral infectious diseases, such as the coronavirus that causes COVID-19. (Courtesy photo)

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Photo by: Courtesy Photo |  VIRIN: 200514-F-ZZ999-1001.JPG