Suncourt HC500 Flush Fit 4 x 10 Register Booster Fan
Use this Register booster fan to increase airflow from under performing registers to improve the temperature in your rooms. This register booster fan features three speeds and two fans to pull extra air out of the ductwork. Don't leave warm or cooled air lingering in your ducts, put it into your living space where it belongs. The Flush Fit register booster fan can boost airflow by up to 85%.
Using a register booster fan saves money and works automatically with forced air system.