The HVAC blower assembly is responsible for circulating air throughout the building by drawing in outside air, filtering it, heating or cooling it as necessary, and then distributing it through the ductwork. The blower assembly typically consists of a fan, a motor, and a housing.The thermostat sends signals to the blower assembly to adjust the fan speed and temperature of the air as n... https://www.partshnc.com/hvac-controls/blower-assembly