Upon arrival checked airflow left side of home is getting minimal airflow 3/4 duct on back side feel less powerful than should be. Ducts do not have any dampers, filter was dirty replaced, did not see any rips or tears in duct work all were connected. Calculated duct work below, (2) 12inch equal 1000CFM needing 1400CFM, 400CFM off on returns side (2) 8’ (1) 4’ (10) 6’=1100 CFM Needing 1400CFM on supply side. Recommend getting comfort specialist out to give recommendations on duct rework.