Most standard In-Row coolers adopt **front supply (cold aisle) + rear return (hot aisle)** horizontal airflow. Cold air blows horizontally to server intake from the front of the unit, while hot exhaust air from IT racks is directly drawn into the rear air inlet. This short air loop eliminates hot spots and fits high-density AI/GPU racks above 30kW per rack. Reverse airflow (rear supply, front return) is only for special customized layouts and not standard configuration.
