A heat exchange system comprising: a tubular fan air inlet portion and a tubular cooled air outlet portion connected to a first end of a tubular mid portion; a tubular hot air inlet portion and a tubular recycled fan air outlet portion connected to a second end of the mid portion; an integrally-formed, compliant heat exchanger tube extending between the hot air inlet portion and the cooled air outlet portion within the mid portion to define a heat exchanger first flow passage within the heat exchanger tube and a second flow passage outside of the heat exchanger tube but within the tubular mid portion, the integrally-formed, compliant heat exchanger tube comprising: a tubular member having a proximal tube end coupled with the hot air inlet portion and a distal tube end coupled with the cooled air outlet portion and comprising a tubular wall having an outer wall surface and an inner wall surface; a plurality of integral heat transfer fins extending radially outwardly from at least one portion of the tubular member; characterised by an integral bellows portion, the integral bellows portion comprising a bellows in the outer wall surface and a slip joint in the inner wall surface; wherein the slip joint comprises radially-inner and radially-outer adjacently overlapping members, (a,b) and wherein the radially-inner overlapping member (a) comprises a backward-facing step portion that angles away from an air flow direction inside the integrally-formed compliant heat exchanger tube.. a tubular fan air inlet portion and a tubular cooled air outlet portion connected to a first end of a tubular mid portion; a tubular hot air inlet portion and a tubular recycled fan air outlet portion connected to a second end of the mid portion; an integrally-formed, compliant heat exchanger tube extending between the hot air inlet portion and the cooled air outlet portion within the mid portion to define a heat exchanger first flow passage within the heat exchanger tube and a second flow passage outside of the heat exchanger tube but within the tubular mid portion, the integrally-formed, compliant heat exchanger tube comprising: a tubular member having a proximal tube end coupled with the hot air inlet portion and a distal tube end coupled with the cooled air outlet portion and comprising a tubular wall having an outer wall surface and an inner wall surface; a plurality of integral heat transfer fins extending radially outwardly from at least one portion of the tubular member; characterised by an integral bellows portion, the integral bellows portion comprising a bellows in the outer wall surface and a slip joint in the inner wall surface; wherein the slip joint comprises radially-inner and radially-outer adjacently overlapping members, (a,b) and wherein the radially-inner overlapping member (a) comprises a backward-facing step portion that angles away from an air flow direction inside the integrally-formed compliant heat exchanger tube. a tubular member having a proximal tube end coupled with the hot air inlet portion and a distal tube end coupled with the cooled air outlet portion and comprising a tubular wall having an outer wall surface and an inner wall surface; a plurality of integral heat transfer fins extending radially outwardly from at least one portion of the tubular member; characterised by an integral bellows portion, the integral bellows portion comprising a bellows in the outer wall surface and a slip joint in the inner wall surface; wherein the slip joint comprises radially-inner and radially-outer adjacently overlapping members, (a,b) and wherein the radially-inner overlapping member (a) comprises a backward-facing step portion that angles away from an air flow direction inside the integrally-formed compliant heat exchanger tube..