The copper core HX-120HL provides an approximate 400W of added heat dissipation when coupled with one 120mm fan. With a fin density of 11 FPI (fins per inch), it is optimized for low/quiet air flow. Horizontal G 1/4 BSPP threaded fitting sockets. BLT-HX025 mounting screw kit included. Dual pass, 15mm (0.59") fan hole spacing, copper fins with brass pipes.