Sterling Heatrim Baseboard RA-OCF-90 Hydronic Baseboard Heater 90 Deg Outside Corner 3/4" Copper Tube with 50-52 Aluminum Fins Per Foot. Dent-Resistant Front Panel. Pivot-Mounted Damper 7-3/8" H, Extends 2-11/16" From Wall Length: 90 Outside Corner.