"Usually poor air flow results from a dirty air filter or ductwork that has become blocked, crimped or even disconnected. Possible Solutions: Confirm air filter is clean. If dirty, clean or replace the air filter. Visually inspect all ductwork to make sure it has not become disconnected or crimped. This includes ductwork that may be in difficult to reach attic, basement or crawl spaces. Repair or connect as needed. Check registers dampers on vents in the rooms to make sure they are set to an open position."