Suncourt HC500 Flush Fit 4 x 10 Smart 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 pulls 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.
This improved model has self-learning technology built in that turns the register booster on and off with your heating and air conditioning system, no programming necessary.