A blower motor, or also simply blower, is a powered machine that makes air flow by the rotational movement of vanes or blades, which are known as an impeller, rotor, or runner. Usually it has some form of housing or casin.High-performance blowers provide increased airflow, which reduces the amount of cold spots in the home and improves the performance of humidifiers and air purifiers. They also feature nearly silent motors, so you may not even hear the system running.