ST2180AL1H0E0MS TRANQUILITY ST ROOFTOP R-454B 15 TON 460/60/3 W/REFRIGERANT DETECTION SYSTEM MODULATING ENTHALPY ECONOMIZER EXT RANGE 2" MERV 8 FILTERS CXM2.5 CNTRLS W/DISCONNECT & GFI OUTLET COATED AIR COIL