The AFG PRO-3.0 advanced attic gable fan includes our standard efficiency permanent split capacitor motor. Known as a “PSC” motor, this motor offers above-average efficiency with enormous value and performance. In fact, the AFG PRO-3.0 is the most powerful residential attic fan on the market today. It moves up to 3x the amount of airflow of a traditional attic fan at up to 1.6x better efficiency.