Empty cabinets and empty rack unit positions can allow hot air to migrate into the cold aisle, causing unwanted temperature issues. Using blanking panels and side panels mitigates this. Hot and cold aisle containment is a proven strategy to optimize airflow, reduce energy costs, and improve cooling efficiency. Whether you need cold aisle. While advanced cooling systems like chilled water plants and CRAH units play a major role, one of the most effective strategies is much simpler: controlling how air moves through the data hall. Finally, seal openings in the raised floor using floor grommets.