Hot aisle / cold aisle configurations switch the forward direction of every other row so that two rows face each other and have their backs to the next row. This avoids the hot exhaust of one row of racks being sucked into the cooling intake of an adjacent row. Air conditioning ducts or vents are located between the two fronts since most equipment vents front to rear. A drawback of unenclosed hot aisle / cold aisle configuration is that there is a significant amount of uncontrolled or bypass mixing of hot and cold air outside the equipment.

Dimundo Has carried out full install of Hot and Cold aisles in both the UK and in Europe.