Belden's XFPWB1U101 is a 1RU filler panel with a brush strip, which allows blocking of RU for optimized airflow and separation between cold supply air and hot return air while still providing passthrough of cables. This panel fits the universal measurement of mount racks and cabinets at 1RU (one rack unit) for 19" horizontally. The best practices for these panels are indoor data centers to blank unused rack units.