EC fans meaning electronically commutated fans offer comprehensive economic performance and environmental advantages over the traditional Fans. They come with a brushless DC motor and have no energy and consequent efficiency losses. Speed is 100% speed controllable, not frequency dependant. Can be set-up for constant airflow or constant pressure.
Plug fans are blowers without housing, or open type blowers. Majorly used for hot air circulation, in the dust collector where they are fitted directly on the body. This fan is generally designed in accordance to data like operating temperature, circulation required, airflow required, pressure inside the fan.