Derek Cole shows how a dirty blower motor and wheel block airflow in your HVAC system. Keep these components clean, seal your ductwork, and prevent freezing to maintain proper flow.
Really, the big cause outside of airflow is a dirty blower motor, dirty blower wheel. So again, when that air cannot anymore, when the air cannot get through to the inside of the house, to the duct system, that's going to cause an airflow problem. So make sure your unit is clean, make sure your duct system is sealed, and make sure you don't have that freezing going on with your system.
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