Tjernlund register booster fans are designed to deliver a whisper-quiet operation with a low-sone cross-flow blower capable of generating 50 % less noise, as compared to buzzing muffin fans. These air vent boosters are best suited for increasing the airflow in excessively hot or cold rooms and feature a screened blower wheel for eliminating accidental hazards. They further come equipped with a 6-feet-long power cord for remote installations in warehouses or other storage facilities and built-in 45-degree turning vanes (on selected models) to guide the airflow to the centre of the room. The integrated discreet sensor of these register booster vents is capable of operating in both manual and automatic modes, irrespective of the season.