50TC18-29 WeatherMaker® Single Packaged Rooftop Cooling Only Horizontal Air Flow Unit with Puron® (R-410A) Refrigerant, 15 to 25 Nominal Tons 50TC18-29 WeatherMaker® Single Packaged Rooftop Cooling Only Horizontal Air Flow Unit with Puron® (R-410A) Refrigerant, 15 to 25 Nominal Tons