Ventiva's Smart Register Booster Fan drops right into your existing 4x10" or 4x12" floor or wall vent and pushes 2-3x more airflow into the rooms that never get warm or cool enough. Whisper-quiet variable speed motor, built-in thermostat that auto-adjusts to room temp, and a remote control so you never have to bend down and fiddle with a vent again. Installs in under 60 seconds, no tools needed.