The modular cold aisle system serves as a core cooling infrastructure for data centers. By creating a sealed, independent air channel on the front side of server racks, it effectively separates hot and cold airflows, addressing industry challenges such as localized hotspots and high cooling energy consumption. Constructed entirely from industrial-grade sheet metal, the product features high structural strength and excellent sealing performance, and is compatible with standard 19-inch rack cabinets. Standardized modules support flexible configuration and expansion, making them suitable both for large-scale new computing facility deployments and retrofits in existing data centers. This solution helps reduce PUE, enabling a safe, stable, green, and energy-efficient physical operating environment for data centers.