Heating, ventilation, air conditioning, and refrigeration Airmen maintain heating and cooling on base

Senior Airman Kristian Martinez-felix, right, a 319th Civil Engineer Squadron heating, ventilation, air conditioning and refrigeration apprentice, and Senior Airman Tristan Miles, a 319th HVAC-R journeyman, begin maintenance on the water boilers June 20, 2018, on Grand Forks Air Force Base, North Dakota. Martinez-felix said that every building on base will have a water boiler in the building. (U.S. Air Force photo by Airman 1st Class Melody Wolff)

PHOTO BY: Airman 1st Class Melody K. Wolff
VIRIN: 200618-F-VG991-1010.JPG
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