What is the objective of hot aisle/cold aisle containment?

• A. To maximize energy usage by mixing hot and cold air.
• B. Align cold supply air to equipment intakes and contain hot exhaust to prevent recirculation, with proper seals and door management.
• C. To increase airflow resistance to reduce cooling.
• D. To eliminate the need for seals and doors.

Answer: (B)

Separating hot and cold air streams is the core idea here. The objective is to deliver cold supply air directly to the equipment intakes while containing the hot exhaust so it cannot recirculate back into the servers. Achieving this relies on proper seals and door management to minimize gaps and bypass air, keeping cold air in the cold aisle and hot air in the hot aisle. With that separation, cooling becomes more efficient, the system can run more predictably, and energy use is reduced because the cooling units don’t have to chase mixing and recirculation.