The Vevor register booster fan is designed to improve airflow from your HVAC system to rooms that need better heating or cooling. It fits standard 4" x 12" floor or wall registers and features 10 adjustable speeds for customized comfort. An LCD thermostat controller and included remote make it easy to adjust airflow automatically or manually. Its energy-efficient 6W PWM motor delivers up to 100 CFM while operating quietly. The aluminum frame adds durability and a clean finished look for home interiors.