Equalizer EQ2 register booster with flame retardant housing sits on top of the register and boosts airflow to rooms that are too hot or too cold. Boosts air flow up to 80%. Features 3 adjustable controls and built-in temperature sensor with automatic operation. Fits over floor and wall registers up to 6" x 12". Place-and-plug convenience. 6' cord. 1 year limited warranty.