The Vevor register booster fan is designed to improve airflow from your HVAC system to rooms that need better heating or cooling circulation. It fits standard 4" x 10" register openings and delivers up to 100 CFM with 10 adjustable speed settings. The unit features a programmable LCD controller with thermostat-based operation for automatic airflow adjustment. A remote control lets you change speed and modes from across the room. Its aluminum construction and quiet low-noise design make it a practical upgrade for home comfort.