In a data cetner, a coil wall is installed along one or both sides of serveroom. It consists of a chilled-water coil and fans, forming a large continuous wall. A Concept Coil Wall The basic operating principle is simiar to that of a CRAH(Computer Room Air Handler), where air passes through a cooling coil supplied with chilled water. However, unlike the CRAH, which is a standalone unit, the coil..