Heat exchanger baffle

In a tube and shell heat exchanger that has longitudinal and transverse axes, said longitudinal axis being longer than said transverse axis, said shell enclosing an inner volume of said exchanger, said exchanger having associated with said shell and inner volume a removable bundle containing a channel having a pass partition, at least one longitudinally extending tube, a long baffle, and a tubesheet, said long baffle and said at least one tube extending into said inner volume, said long baffle extending in an essentially flat plane along said longitudinal and transverse axes and dividing said inner volume into at least two sections with a portion of said at least one tube in each section, said long baffle having opposed longitudinally extending edges, said long baffle extending across said transverse axis essentially to but spaced from said shell thereby defining a gap between each of said edges and said shell, the improvement comprising each of said longitudinally extending edges being angled away from said essentially flat plane of said long baffle at a finite angle, and each of said angled edges carrying at least one leaf seal that bridges said gap.