Fin for a finned pack for heat exchangers, as well as heat exchanger

A fin for a finned pack for heat exchangers, comprising:

• a plate in which a plurality of through holes is made for positioning of tubes adapted to convey a first heat exchange fluid;
• said plate having:
• an edge;
• two main faces each adapted to be licked by a second heat exchange fluid in a crossing direction from an inlet portion to an outlet portion of said edge of said plate;
• and
• said holes being delimited by a respective inner delimiting wall of said plate including a first portion facing towards said inlet portion and a second portion facing towards said outlet portion,
• said fin comprising at least one confinement unit of said second fluid arranged around a hole of said plurality of holes to obtain at least one partially surrounded hole,
• said at least one confinement unit comprising two baffles or two through housing recesses for housing baffles arranged one opposite the other with respect to a respective partially surrounded hole as well as each surrounding and spaced from a respective section of said second portion of said delimiting wall of said partially surrounded hole, so as to confine, during use, on said plate a first flow zone of said second fluid between each baffle or recess and a respective section of said second portion of said delimiting wall.