A CRAH (Computer Room Air Handler) is a precision air-handling unit that cools a data hall by passing return air over a chilled-water coil, with heat carried away by the facility's chiller plant. Having no on-board compressor, it uses variable-speed fans and modulating valves for efficient, closely controlled cooling and is typical of larger chilled-water facilities.
Category: Cooling & Environmental Control · Subcategory: Air Cooling · Part of the AIDC Technical Terminology reference.