A technician working in the datacenter has finished racking a new 4U server into a new rack. Which of the following should the technician do to allow for hot/cold aisle containment?

Perforated floor tiles are used to deliver cold air from the underfloor plenum into the cold aisle - closing them restricts cold air delivery rather than supporting containment.

Resetting temperature and humidity controls is a calibration or monitoring action and does not address the physical airflow mixing problem that blanking panels solve.

Blanking panels are installed in unused 1U rack spaces to eliminate gaps that allow hot air from the exhaust side (hot aisle) to recirculate back to the intake side (cold aisle). Without blanking panels, hot and cold air mix freely through empty rack slots, undermining the entire aisle containment strategy and reducing cooling efficiency.

Lowering HVAC temperature increases overall cooling capacity but does not prevent hot and cold air from mixing through open rack spaces, which is what aisle containment requires.