Assembly of baffles and seals and method of assembling a heat exchanger

An assembly of baffles and seals for mounting in a heat exchanger shell, which assembly comprises

• a plurality of longitudinal baffles each having two longitudinal rims;
• a plurality of longitudinal seals for sealingly engaging the longitudinal rims of the longitudinal baffles against the heat exchanger shell after mounting;
• and
• a wall member having a folded longitudinal rim that is arranged to extend between longitudinal seals of adjacent longitudinal baffles so as to form a double wall with the heat exchanger shell after mounting,
• wherein each of said plurality of longitudinal seals is a two piece seal comprising a U-shaped flange and a wall sealing member, said wall sealing member being formed of oppositely outwardly extending elastic flanges, said U-shaped flange having folds into which said opposite outwardly extending elastic flanges are inserted and held, and wherein said U-shaped flange is arranged to also receive the folded longitudinal rim of the wall member extending from that longitudinal seal.