Hole diameter  hole distance  row distance  Fin distance   Fin configuration

∮7mm        21mm          12.7mm       1.6-2.0mm     bare/louver

∮9.52mm     25mm          21.65mm      1.6-3.5mm     bare/louver/ripple

∮12.7mm     31.75mm       27.5mm       1.8-3.5mm    bare/louver

∮15.88mm    38mm          32.9mm       2.0-3.5mm    bare/ripple

material :copper tube, copper fin ,aluminum fin

shape: plate plain .shape L ,shape U , shape V, arc shped