I work in a hospital, a few days ago we had a interesting coincidence we had to test a fire door later in the day we had a comlaint of no cooling in some areas. we found we were not getting air past a certian area so we started looking at smoke and fire dampers and fornd the a airline blown off a air actuator. Now my question is there a better way look for a blockage or do you do the same thing we had to do just start moving celing tile and chasing the duct work?