Applying airside and waterside economizer to data center projects requires additional consideration to fulfill the unique design criteria that is not common to other commercial building types. Waterside economizer design considerations include proper equipment sizing, cooling tower freeze protection, pump design for parallel and series configuration, and control strategies for system stability. Airside economizer design considerations include humidification, particulate contamination, gaseous contamination, fire prevention, smoke detection, supply and return air balancing.Units: Dual