Maximum Aisle Length: When equipment cabinets form a continuous row, the aisle length should not exceed 16 meters. Hot. Hot aisle and cold aisle containment are foundational concepts in data center design. Each panel helps direct and balance underfloor air pressure, ensuring cold air is delivered efficiently to the IT equipment that needs it most. Cold aisle containment (CAC) is a proven data center cooling strategy that creates physical barriers around cold air supply zones, preventing contamination from hot exhaust air and eliminating the energy-wasting effects of air mixing. Dominion forecasting a demand reaching 9 GW by 2035. Data center growth is impacting PJM region as well.