DATA CENTER MEP Design REVIEW SERIES CRAH & CRAC CHECKLIST: Airflow · Coil Selection Fan Redundancy EC Fans Humidification Drain Filtration Controls Clearances

Computer Room Air Handler (CRAH) and Computer Room Air Conditioner (CRAC) units are the workhorses of data center cooling. Whether chilled-water CRAHs served by a central plant or self-contained DX CRACs with integral compressors, these units determine whether IT equipment sees stable inlet temperature and humidity - or whether it doesn't. A poorly specified or poorly commissioned unit can undermine an otherwise well-engineered mechanical system.This checklist is built for use at three points in a project: design review (does the specification and layout make sense before it is built), factory/field acceptance (does the equipment as delivered match the design intent), and operational readiness (is the unit ready to be trusted with a live load). Each chapter maps to one of nine review domains that recur across nearly every CRAH/CRAC deployment, regardless of manufacturer.