Disclosed is a tube assembly for a shell and tube heat exchanger, the tube assembly having: a plurality of tubes respectively extending in a lengthwise direction L to a respective plurality of opposing ends at respective opposing internal ends of the heat exchanger, the plurality of tubes being collectively arranged in a first grid pattern, wherein the plurality of tubes form a respective plurality of grid nodes; and a plurality of fins connecting the plurality of tubes to form a respective plurality of grid edges, the plurality of fins extending to opposing ends of the plurality of tubes, wherein the plurality of fins each include a plurality of through holes formed therein.