Metal Fin for Air Heat Exchanger

Metal fin for tube heat exchanger (2), forming an indirect exchange surface intended to increase heat transfer between the tubes (2), in which a fluid circulates, and the air circulating between the tubes and along the surface of the fin in a determined direction of flow, the fin comprising a series of mounting collars (5) for the tubes (2) and means (7) for increasing heat exchanges between the air and the fin, characterized in that the means for increasing heat exchanges consist of:

• at least diverting conformations (10) each arranged upstream of an aperture (3) when considering the direction of air flow (F) to force the air to pass either side of said aperture,
• and diverting conformations (11) each arranged, when considering the direction of air flow (F), downstream of an aperture (3) belonging to a row to force the air to pass either side of apertures belonging to a subsequent row, the upstream (10) and downstream (11) diverting conformations of two superimposed apertures (3) belonging to one same column extending along a determined length so that substantially rejoin at the plane of extension (P) of staggered apertures belonging to an intermediate row with respect to the upstream and downstream rows to which the superimposed apertures belong.