What are Rear Door Cooling Coils?

Rear Door Cooling Coils are rack-mounted, air-to-liquid heat exchangers installed on the rear door of server cabinets in computer rooms and data centers. They cool the hot exhaust air from servers by passing it through a finned coil supplied with chilled water or facility water.

By removing heat directly at the rack level, Rear Door Cooling Coils prevent hot air from entering the computer room, allowing higher rack power densities, improved energy efficiency, and reduced reliance on traditional room-based cooling systems. They are commonly used in high-density server, network, AI, and HPC environments.