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Heating, ventilation, air conditioning, and refrigeration Airmen maintain heating and cooling on base
Senior Airman Kristian Martinez-felix, a 319th Civil Engineer Squadron heating, ventilation, air conditioning and refrigeration apprentice cleans an air conditioning system June 20, 2018, on Grand Forks Air Force Base, North Dakota. Martinez-felix said that by cleaning the air conditioning systems, it ensures they are functioning properly and that no excess bacteria are spread through ventilations. (U.S. Air Force photo by Airman 1st Class Melody Wolff)