Repaired ducts today. There is 960 cam going into a 3 ton system and 1190cfm coming out. Recommend adding a 9in return duct to make sure there is enough air going into the system. Also did a fall tune up today. Cleaned flame sensor, cleared inducer draft port, ensured all amp draws and refrigerant pressures are normal. Recommend blower wheel cleaning and duct cleaning, left estimates for both.