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HVAC Airmen ensure base airflow

SHAW AIR FORCE BASE, S.C. -- U.S. Air Force Senior Airman Jesse Brown, 20th Civil Engineer Squadron heating, ventilation and air conditioning (HVAC) apprentice, changes out filters in an HVAC system at Shaw Air Force Base, S.C., Aug. 30, 2017. Air filters around the base are checked for dust weekly and replaced as needed. (U.S. Air Force photo by Senior Airman Ashley Maldonado)