This 20" Whole House Ventilation Fan is ideal for locations where permanent attic mounted ventilating fans cannot be installed. 3-speed permanent split capacitor motor. Three-wing impact resistant fan blade. Easy to install, the fan can be mounted outside of window trim for shallow sill applications. 6-ft. 18/3-conductor cord with molded plug. Exhaust Fan model 9166D - Over 1600 RPM's of cooling power - complete steel construction fan body and blade ensures long life.