The heat exchange finned surface contains lamellar transverse rectangular ribs on the outer flat parts of the side surfaces of two cylindrical bases of planar oval shape in cross section. At the same time, on the lamellar transverse rectangular fins perpendicular to the axis of the plane-oval base along the fins are made through slots with a width u not exceeding the fin thickness δ, a depth l not exceeding 0.6 of the fin height hp, and the width b of the cut sections of the fin is not more than 18-20 mm.
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