The Tripp Lite SRXCOOL12K Rack A/C System is a next-generation air conditioner designed for supplemental area cooling, emergency cooling and off-hour cooling applications. The SRCOOL12K uses R410a refrigerant, which complies with EPA standards. The SRCOOL12K has a built-in evaporator that expels the condensed water through the exhaust duct, so there is no need for a drain tube, drain pan or water collection tank.