CompTIA Server+ SK0-005 Practice Question

The open rack units located between the two groups of equipment allow hot exhaust air to curl back into the cold aisle and be drawn into the intakes of the upper servers. Installing blanking (filler) panels across those unused U-spaces seals the openings so cold supply air is forced through the equipment instead of bypassing it, eliminating recirculation and lowering inlet temperatures. Rotating servers so their rear panels face the cold aisle disrupts the hot-aisle/cold-aisle scheme and is specifically discouraged by industry guidelines. Swapping a perforated rear door for a solid door would trap heat rather than remove it, while increasing CRAC fan speed addresses room-level airflow-not the localized bypass caused by empty rack spaces-and wastes energy without fixing the root cause.